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Representative publications

T. Aizawa, H. Arima, S. Mihara, T. Ueno, S. Yoshii, T. Saito, H. Itabashi, S. Datta, H. Hanayama, A. Sakamoto, R. Shimada, S. Rogers, M. Hollamby, T. Kajitani, Y. Ishii, G. Watanabe, K. Harano, T. Matsumoto, N. Pathoor, M. Vacha, H. Sotome, S. Yagai: Folding-Mediated Self-Assembly of Sterically Demanding π-Luminophore Dyads into Nanotubes Exhibiting Multidirectional Exciton Transport. J. Am. Chem. Soc. (2026); DOI: 10.1021/jacs.6c00854
Martin Vacha: Unveiling the nanoscale dynamics of electroluminescence (News & Views). Nat. Photonics (2026); DOI: 10.1038/s41566-026-01895-2
Qiwen Tan, Sudipta Seth, Boris Louis, Xiayan Wu, Nithin Pathoor, Toranosuke Takagi, Shun Omagari, Takumi Sannomiya, Johan Hofkens, Martin Vacha: Room Temperature Collective Blinking and Photon Bunching from CsPbBr3 Quantum Dot Superlattice. Nat. Commun. (2026); DOI: 10.1038/s41467-026-70931-0
Y. Wang, M. Vacha, S. Omagari: Controls and evidence for assigning europium emission in Eu-treated CsPbCl3 nanocrystals. Phys. Chem. Chem. Phys. (2026); DOI: 10.1039/D6CP00181E
Charlie Henderson, Adriano S. Marques, Izabela S. Bicalho, Lucy J. F. Hart, Amy Monahan, Katherine Stewart, Koki Asano, Tianhao Lan, Martin Vacha, Molly M. Stevens, Piers R. F. Barnes, Diego Bagnis, Ji-Seon Kim: Nanoparticle-Mediated Interface Engineering for Uniform, Reproducible Electron Transport Layers in Scalable Perovskite Solar Cells. ACS Appl. Mater. Interfaces 18 (2026) 12738–12748. DOI: 10.1021/acsami.5c24295
Toranosuke Takagi, Yoshinori Kimoto, Nithin Pathoor, Shun Omagari, Tadashi Kawamoto, Takuya Kato, Hiroaki Nakamura, Issei Takenaka, Martin Vacha: Synthesis and single-particle photophysics of BaZrS3 chalcogenide perovskite quantum dots. Nanoscale 18 (2026) 1521–1529. DOI: 10.1039/D5NR05045F
Tomoaki Sakurada, Nithin Pathoor, Takuma Matsumoto, Rattapon Khamlue, Petcharaphorn Chatsiri, Jan Valenta, Tadashi Kawamoto, Shun Omagari, William A. Tisdale, Watcharaphol Paritmongkol, Yeongsu Cho, Martin Vacha: Silver Organochalcogenide Semiconductors: Color Tunable Luminescence, Polarized Emission, and Long-Range Exciton Diffusion. J. Am. Chem. Soc. 147 (2025) 39516–39526. DOI: 10.1021/jacs.5c12551
Rattapon Khamlue, Petcharaphorn Chatsiri, Tomoaki Sakurada, Jesadaporn Chotimook, Pimpan Leangtanom, Pongkamon Prayongkul, Thassanant Atithep, Jintara Padchasri, Pinit Kidkhunthod, Martin Vacha, Pichaya Pattanasattayavong, Watcharaphol Paritmongkol: Chelation-Driven Dissolution and Single-Crystal Growth of Hybrid Metal Organochalcogenide Semiconductors by Polydentate Amines. J. Am. Chem. Soc. 147 (2025) 37242–37254. DOI: 10.1021/jacs.5c10260
Shun Omagari, Eisuke Hirao, Martin Vacha: Luminescence Variability of CsPbBr3 Nanocrystals in Single-Particle Emitter Applications. ACS Appl. Nano Mater. 8 (2025) 16603-16613, DOI: 10.1021/acsanm.5c03524
Masaya Yoshida, Kyota Yasuda, Takuma Matsumoto, Yudai Ono, Naoyuki Hisano, Mao Kawasaki, Takehiro Hirao, Ye Yuan, Shin-ichi Tate, Martin Vacha, Takeharu Haino: Vortex-Flow-Directed Chiral Macroscopic Ordering of Platelet Nanostructures Formed via the Supramolecular Assembly of Platinum Complexes with Bis(phenylisoxazolyl)benzene. J. Am. Chem. Soc. 147 (2025) 30674–30683. DOI: 10.1021/jacs.5c03761
Xiayan Wu, Shun Omagari, Martin Vacha: Anisotropic Cation Migration Drives the Formation and Stability of Lateral 3D/2D Perovskite Heterostructures. ACS Energy Lett. . 10 (2025) 3089-3095. DOI: 10.1021/acsenergylett.5c01551
Sudipta Seth, Boris Louis, Koki Asano, Toon Van Roy, Maarten B. J. Roeffaers, Elke Debroye, Ivan G. Scheblykin, Martin Vacha, Johan Hofkens: Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging Chem. Biomed. Imaging 3 (2025) 244-252. https://doi.org/10.1021/cbmi.4c00113
X. Wu, N. Pathoor, X. Xu, S. Omagari, T. Takagi, M. Vacha: Real-Time Structural Dynamics at the 3D/2D Perovskite Interface in CsPbBr3/PEA2PbBr4 Nano-heterostructures.Nano Lett.25 (2025) 291-298
M. Tanaka, Y. Kiriki, M. Hayashi, A. Tamang, T. Nakamura, M. Vacha, Y. Choi, J. Choi, W. Yoshida, K. Critchley, S. D. Evans, and M. Okochi: Small Au Nanoparticles Synthesized by Peptide-Based Biomineralization for Catalytic Applications.ACS Appl. Nano Mater.7 (2024) 11258-11266
Q. Tan, N. Koishihara, S. Omagari, T. Hirao, T. Haino, M. Vacha: Spectrally selective leakage of light from self-assembled supramolecular nanofiber waveguides induced by surface plasmon polaritons. J. Phys. Chem C (2024) DOI: 10.1021/acs.jpcc.3c08258
B. Demirkurt, D. Petrova, D.K. Sharma, M. Vacha, B.Weber, D. Bonn, A. Brouwer: Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging. J. Phys. Chem. Lett.15 (2024). 1936-1942
S. Takahashi, T. Matsumoto, M. J. Hollamby, H. Miyasaka, M. Vacha, H. Sotome, S. Yagai: Topologically Enhanced Emission in Quasi-One-Dimensionally Stacked p-Conjugated Rosettes. J. Am. Chem. Soc. 146 (2024). 2089-2101 DOI: 10.1021/jacs.3c11407
X. Wu, S. Omagari, J. Gao, M. Vacha: In-Situ Monitoring of Nanocrystal Formation and Ion migration in Lead Halide Perovskite-Metal Organic Framework Composites. Adv. Opt. Mater.12 (2024). 2301479 DOI: 10.1002/adom.202301479
T. Takagi,S. Omagari,M. Vacha: Suppression of blinking in single CsPbBr3 perovskite nanocrystals through surface ligand exchange. Phys. Chem. Chem. Phys., 2023, 25, 19004-19012
Y. Kitagawa, K. Shima, T. Nakai, M. Kumagai, S. Omagari, P. P. F. da Rosa, S. Shoji, K. Fushimi, Y. Hasegawa: Thermally-assisted photosensitized emission in a trivalent terbium complex. Commun. Chem. 6 (2023), 122
A. Agarwal, S. Omagari, M. Vacha: Air-stable mixed cation lead halide perovskite films and microscopic study of their degradation process.Nanoscale 2023, DOI: 10.1039/D3NR02003G
T.Nakamura,S.Omagari,X.Liang,Q.Tan,K.Nakajima,M.Vacha: Simultaneous force and fluorescence spectroscopy on single chains of polyfluorene:effect of intra-chain aggregate coupling.ACS Nano(2023);doi:10.1021/acsnano.2c09773
A. Agarwal, S. Omagari, M. Vacha: Nanoscale structural heterogeneity and efficient inter-grain charge diffusion in a series of mixed MA/FA halide perovskite films. ACS Energy Lett. 7 (2022) 2443-2449
H. Yan, T. W. Tseng, S. Omagari, I. Hamilton, T. Nakamura, M. Vacha and J. S. Kim: Dynamic Molecular Conformational Change Leading to Energy Transfer in F8-5% BSP Copolymer Revealed by Single-Molecule Spectroscopy. J. Chem. Phys. 156 (2022) 074704
Y. Goto, S. Omagari, R. Sato, T. Yamakado, R. Achiwa, N. Dey, K. Suga, M. Vacha, S. Saito: Dynamic Polymer Free Volume Monitored by Single-Molecule Spectroscopy of a Dual Fluorescent Flapping Dopant. J. Am. Chem. Soc. 143 (2021) 14306-14313,
R. Furuya, S. Omagari, Q. Tan, H. Lokstein, M. Vacha: Enhancement of the Photocurrent of a Single Photosystem I Complex by the Localized Plasmon of a Gold Nanorod. J. Am. Chem. Soc. 143 (2021) 13167-13174
K. Ueda, M. Aizawa, A. Shishido, M. Vacha: Real-time molecular-level visualization of mass flow during patterned photopolymerization of liquid-crystalline monomers. NPG Asia Materials 13 (2021) 25
T. W. Tseng, Y. Hao, T. Nakamura, S. Omagari, J. S. Kim, M. Vacha: Real-Time Monitoring of Formation and Dynamics of Intra- and Interchain Phases in Single Molecules of Polyfluorene. ACS Nano 14 (2020) 16096-16104
T. Nakamura, M. Vacha: Mechanically induced conformation change, fluorescence modulation and mechanically assisted photodegradation in single nanoparticles of the conjugated polymer poly(9,9-dioctylfluorene). J. Phys. Chem. Lett. 11 (2020) 3103-3110
D. K. Sharma, S. Hirata and M. Vacha: Energy localization vs. charge funneling in aggregates of CsPBr3 perovskite nanocrystals. J. Lumin. 222 (2020) 117119
S. Omagari and M. Vacha: Toward Accurate Measurement of Intrinsic Quantum Yield of Lanthanide Complexes with Back Energy Transfer. Phys. Chem. Chem. Phys. 22 (2020) 3683-3690
F. Piccinelli, C. de Rosa, A. Lazarowska, S. Mahlik, M. Grinberg, T. Nakanishi, S. Omagari, M. Bettinelli: Optical properties of Eu(III) and Tb(III) complexes with pyridine- and quinoline- based ligands under high hydrostatic pressure. Inorg. Chim. Acta 499 (2020), 119179
D. Petrova, D. K. Sharma, M. Vacha, D. Bonn, A. Brouwer, B. Weber: Ageing of polymer frictional interfaces: the role of quantity and quality of contact. ACS Appl. Mater. Interfaces 12(2020)9890-9895
D. K. Sharma, S. Hirata and M. Vacha: Single-particle electroluminescence of CsPbBr3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors. Nature Commun (2019) 4499 DOI: 10.1038/s41467-019-12512-y.
S. Ghimire, V. C. Nair, C. Muthu, K. Yuyama, M. Vacha and V. Biju: Photoinduced photoluminescence enhancement in self-assembled clusters of formamidinium lead bromide perovskite nanocrystals. Nanoscale 11 (2019) 9335-9340
D. K. Sharma, S. Hirata, V. Biju and M. Vacha: Stark effect and environment induced modulation of emission in single halide perovskite nanocrystals. ACS Nano 13 (2019) 624-632
K. Narushima, Y. Kiyota, T. Mori, S. Hirata and M. Vacha: Suppressed triplet exciton diffusion due to small orbital overlap as a key design factor for ultralong-lived room temperature phosphorescence in molecular crystals. Adv. Mater. 31 (2019) 1807268.
T. Kameyama, M. Kishi, C. Miyamae, D. K. Sharma, S. Hirata, T. Yamamoto, T. Uematsu, M. Vacha, S. Kuwabata, and T. Torimoto: Wavelength-tunable band-edge photoluminescence of non-stoichiometric Ag-In-S nanoparticles via Ga3+ doping. ACS Appl.Mater. Interfaces 10 (2018) 42844-42855.
S. Hatazaki, D. K. Sharma, S. Hirata, K. Nose, T. Iyoda, A. Kolsch, H. Lokstein and M. Vacha: Identification of short- and long-wavelength emitting chlorophylls in cyanobacterial photosystem I by plasmon-enhanced single-particle spectroscopy at room temperature. J. Phys. Chem. Lett. (2018) 6669-6675.
K. Kanosue, S. Hirata, M. Vacha, R. Augulis, V. Gulbinas, R. Ishige and S. Ando: A colorless semi-aromatic polyimide derived from a sterically hindered bromine-substituted dianhydride exhibiting dual fluorescence and phosphorescence emission. Mater. Chem. Front. (2019) 39-49.
T. Uematsu, K. Wajima, D. K. Sharma, S. Hirata, T. Yamamoto, T. Kameyama, M. Vacha, T. Torimoto, S. Kuwabata: Narrow Band-Edge Photoluminescence from AgInS2 Semiconductor Nanoparticles by the Formation of Amorphous III-VI Semiconductor Shells. NPG Asia Mater. (2018) 713-726.
T. Nakamura, D. K. Sharma, S. Hirata, M. Vacha: Intra-Chain Aggregates as the Origin of Green Emission in Polyfluorene Studied on Ensemble and Single Chain Level. J. Phys. Chem. C 122 (2018) 8137-8146.
B. Yu, J. I. Tracey, Z. Cheng, M. Vacha, D. M. O’Carroll: Plasmonic sphere-on-plane systems with semiconducting polymer spacer layers. Phys. Chem. Chem. Phys. 20 (2018) 11749-11757.
M. Liu, S. Hirata, T. Iyoda, M. Vacha, P. Piotrowiak: Excited State Behavior of Single Strand and Bulk P3HT in Contact with a Au-Nanowire Array. J. Phys. Chem. C 122 (2018) 7925-7933.
B. J. Lidster, S. Hirata, S. Matsuda, T. Yamamoto, V. Komanduri, Y. Tezuka, M. Vacha, M. L. Turner: Macrocyclic Poly(p-phenylenevinylene)s by Ring Expansion Metathesis Polymerization and their Characterization by Single-Molecule Spectroscopy. Chem. Sci. 9 (2018) 2934-2941.
M. Vacha, D. K. Sharma, S. Hirata: Single-molecule studies beyond optical imaging: Multi-parameter single-molecule spectroscopy (Invited Review Article). J. Photochem. Photobiol. C: Photochem. Rev. 34 (2018) 121-136.
L. Bujak, K. Narushima, D. K. Sharma, S. Hirata, M. Vacha: Plasmon enhancement of triplet exciton diffusion revealed by nanoscale imaging of photochemical fluorescence upconversion. J. Phys. Chem. C 121 (2017) 25479-25486.
S. Hirata, M. Vacha: Large Reverse Saturable Absorptin at the Sunlight Power Level Using the Ultralong Lifetime of Triplet Excitons. J. Phys. Chem. Lett. 8 (2017) 3683-3689.
K. Narushima, S. Hirata, M. Vacha: Nanoscale triplet exciton diffusion via imaging of upconversion emission from single hybrid nanoparticles in molecular crystals, Nanoscale 9 (2017) 10653-10661.
L. Bujak, T. Ishii, D. K. Sharma, S. Hirata, M. Vacha: Selective turn-on and modulation of resonant energy transfer in single plasmonic hybrid nanostructures, Nanoscale 9 (2017) 1511-1519.
D. K. Sharma, S. Hirata, L. Bujak, V. Biju, T. Kameyama, M. Kishi, T. Torimoto, M. Vacha: Influence of Zn on the Photoluminescence of Colloidal (AgIn)xZn2(1-x)S2 Nanocrystals, Phys. Chem. Chem. Phys.19 (2017) 3963-3969.
S. Hirata, M. Vacha: White afterglow room-temperature emission from isolated single aromatic unit under ambient condition, Adv. Opt. Mater., 5 (2017) 1600996.
K. Kamada, Y. Sakagami, T. Mizokuro, Y. Fujiwara, K. Kobayashi, K. Narushima, S. Hirata, M. Vacha: Efficient triplet-triplet annihilation upconversion in binary crystalline solids fabricated by solution casting and operated in air, Mater. Horiz. 4 (2017) 83-87.
D. K. Sharma, S. Hirata, L. Bujak, V. Biju, T. Kameyama, M. Kishi, T. Torimoto, M. Vacha: Single-particle spectroscopy of I-III-VI semiconductor nanocrystals: Spectral diffusion and suppression of blinking by two-color excitation, Nanoscale 8 (2016) 13687-13694.
S. Hirata, M. Vacha: Circularly polarized persistent room-temperature phosphorescence from chiral aromatics in air, J. Phys. Chem. Lett. 7 (2016) 1539-1545.
Y. Niko, S. Sasaki, K. Narushima. D. K. Sharma, M. Vacha, G. Konishi: 1-, 3-, 6-, and 8-tetrasubstituted asymmetric pyrene derivatives with electron-donors and -acceptors: high photostability and regioisomer-specific photophysical properties, J.Org.Chem. 80 (2015) 10794–10805.
S. Hirata, M. Vacha: Large　transmittance changes induced by exciton accumulation under weak continuous photoexcitation, Adv. Opt. Mater. 4 (2016) 297-305.
Y. Katsurada, S. Hirata, K. Totani, T. Watanabe, M. Vacha: Photoreversible on-off recording of persistent room-temperature phosphorescence, Adv. Opt. Mater. 3 (2015) 1726-1737.
T. Imagawa, S. Hirata, K. Totani, T. Watanabe, M. Vacha: Thermally activated delayed fluorescence with curcularly polarized luminescence characteristics, Chem. Commun. 51 (2015) 13268-13271.
Y. Tsubomoto, S. Hirata, K. Totani, M. Vacha: Long-lived triplet excitons allowed by intermolecular hydrogen bonding in amorphous matrix, J. Photo. Sci. Tech. 28 (2015) 573-577.
S. Lee, K. Noda, S. Hirata, M. Vacha: Position-dependent three-dimensional diffusion in nematic liquid crystal monitored by single-particle fluorescence localization and tracking. J. Phys. Chem. Lett. 6 (2015) 1403-1407.
S. Hirata, K. Totani, T. Yamashita, C. Adachi, M. Vacha: Large reverse saturable absorption under weak continuous incoherent light. Nature Mater. 13 (2014) 938-946 (Nature Mater, News & Views by Qin & Tang, Highlighted by Noteworthy Chemistry).
Y. Honmou, S. Hirata, H. Komiyama, J. Hiyoshi, S. Kawauchi, T. Iyoda, M. Vacha: Single molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band. Nature Commun. 5 (2014) 4666.
K. Katayama, S. Hirata, M. Vacha: Circularly polarized luminescence from individual microstructures of conjugated polymer aggregates with solvent-induced chirality. Phys. Chem. Chem. Phys. 16 (2014) 17983-17987.
Furumaki, F. Vacha, S. Hirata, M. Vacha: Bacteriochlorophyll aggregates self-assembled on functionalized gold nanorod cores as mimics of photosynthetic chlorosomal antennae: a single molecule study. ACS Nano 8 (2014) 2176-2182.
S. Hirata, K. Totani, T. Watanabe, H. Kaji, M. Vacha: Relationship between room temperature phosphorescence and deuteration position in a purely aromatic compound. Chem. Phys. Lett. 591 (2014) 119-125.
Y. Yabiku, S. Kubo, M. Nakagawa, M. Vacha, S. Habuchi: Super-resolution fluorescence imaging of nanoimprinted polymer patterns by selective fluorophore adsorption combined with redox switching. AIP Advances 3 (2013) 102128 (7 pages).
S. Hirata, K. Totani, H. Kaji, M. Vacha, T. Watanabe, C. Adachi: Reversible thermal recording media using time-dependent persistent room temperature phosphorescence, Adv. Opt. Mater. 1 (2013) 438-442.
K. Totani, Y. Okada, S. Hirata, M. Vacha, T. Watanabe: Thermoresponsive persistent phosphorescent color change using efficient thermally activated reverse energy transfer with a large energy difference, Adv. Opt. Mater. 1 (2013) 283-288
H. Kobayashi, S. Hirata, M. Vacha: Mechanical Manipulation of Photophysical Properties of Single Conjugated Polymer Nanoparticles. J. Phys. Chem. Lett. 4 (2013) 2591-2596.
S. Habuchi, S. Fujiwara, T. Yamamoto, M. Vacha, Y. Tezuka: Single-Molecule Study on Polymer Diffusion in a Melt State: Effect of Chain Topology. Anal. Chem. 85 (2013) 7369-7376.
B. X. Dong, Y. Honmou, H. Komiyama, S. Furumaki, T. Iyoda and M. Vacha: Conjugated polymer chains confined in vertical nanocylinders of a block-copolymer film: preparation, characterization and optoelectronic function. Macromol. Rapid Commun. 34 (2013) 492-497.
S. Furumaki, Y. Yabiku, S. Habuchi, Y. Tsukatani, D. A. Bryant and M. Vacha: Circular dichroism measured on single chlorosomal light-harvesting complexes of green photosynthetic bacteria. J. Phys. Chem. Lett. 3 (2012) 3545-3549.
H. Yoo, S. Furumaki, J. Yang, J. E. Lee, H. Chung, T. Oba, H. Kobayashi, B. Rybtchinski, T. M. Wilson, M R. Wasielewski, M. Vacha and D. Kim: Coherent Coupling between Linear and Trefoil Trimer Perylenediimide Molecules Probed by Single-Molecule Spectroscopy. J. Phys. Chem. B 116 (2012) 12878-12886.
T. Oba and M. Vacha: Relaxation in thin polymer films mapped across the film thickness by astigmatic single-molecule imaging. ACS Macro Lett. 1 (2012) 784-788.
H. Kobayashi, K. Tsuchiya, K. Ogino and M. Vacha: Spectral multitude and spectral dynamics reflect changing conjugation length in single molecules of oligophenylenevinylenes. Phys. Chem. Chem. Phys. 14 (2012), 10114-10118.
H. Kobayashi, S. Onda, S. Furumaki, S. Habuchi and M. Vacha: A single-molecule approach to conformation and photophysics of conjugated polymers (Invited Frontiers Article). Chem. Phys. Lett. 528 (2012) 1-6.
S. Habuchi, H. Fujita, T. Michinobu and M. Vacha: Twist angle plays an important role in photophysical properties of a donor-acceptor type conjugated polymer: A single-molecule study. J. Phys. Chem B 115 (2011) 14404-14415.
S. Onda, H. Kobayashi, T. Hatano, S. Furumaki, S. Habuchi and M. Vacha: Complete Suppression of Blinking and Reduced Photobleaching in Single MEH-PPV Chains in Solution. J. Phys. Chem. Lett. 2 (2011) 2827-2831.
T. Hatano, S. Nozue, S. Habuchi, and M. Vacha: Nanoscale dynamic inhomogeneities in electroluminescence of conjugated polymers. J. Appl. Phys. 110 (2011) 053111.
S. Furumaki, F. Vacha, S. Habuchi, Yusuke Tsukatani , Donald A. Bryant and M. Vacha: Absorption linear dichroism measured directly on a single light-harvesting system: the role of disorder in chlorosomes of green photosynthetic bacteria. J. Am. Chem. Soc. 133 (2011) 6703-6710.
S. Habuchi, T. Oba and M. Vacha, Multi-beam single-molecule defocused imaging reveals anisotropic chain orientation in a polymer thin film. Phys. Chem. Chem. Phys. 13 (2011) 6970-6976
K. Suzuki, S. Habuchi and M. Vacha: Blinking of single dye molecules in a polymer matrix is correlated with free volume in polymers. Chem. Phys. Lett. 505 (2011) 157-160
S. Habuchi, S. Onda and M. Vacha: Molecular weight dependence of emission intensity and emitting sites distribution within single conjugated polymer molecules. Phys. Chem. Chem. Phys. 13 (2011) 1743-1753
M. Vacha, S. Habuchi: Conformation and physics of polymer chains: a single-molecule perspective. NPG Asia Mater. 2 (2010) 134-142
S. Furumaki, S. Habuchi and M. Vacha: Fluorescence-detected three-dimensional linear dichroism: A method to determine absorption anisotropy in single sub-wavelength size nanoparticles. Chem. Phys. Lett. 487 (2010) 312-314
S. Habuchi, N. Sato, T. Yamamoto, Y. Tezuka and M. Vacha: Multimode Diffusion of Ring Polymer Molecules Revealed by a Single-Molecule Study. Angew. Chem. Int. Ed. 49 (2010) 1418-1421
T. Sugimoto, S. Habuchi, K. Ogino and M. Vacha: Conformation related exciton localization and charge-pair formation in polythiophenes: Ensemble and single-molecule study. J. Phys. Chem. B 113 (2009) 12220-12226
Y. Sekiguchi, S. Habuchi and M. Vacha: Nanoscale heterogeneity and light-emission dynamics in solution-processed phosphorescent organic light-emitting devices. Phys. Chem. Chem. Phys. 11 (2009) 8684-8688
S. Habuchi, S. Onda and M. Vacha: Mapping the emitting sites within a single conjugated polymer molecule. Chem. Commun. 2009, 4868
Y. Sekiguchi, S.Habuchi and M. Vacha: Single Molecule Electroluminescence of a Phospherescent Organometallic Complex. ChemPhysChem 10 (2009) 1195
Y. Ebihara and M. Vacha: Relating Conformation and Photophysics in Single MEH-PPV Chains. J. Phys. Chem. B 112 (2008) 12575-12578
T. Sugimoto, Y. Ebihara, K. Ogino and M. Vacha: Structure dependent photophysics studied in single molecules of polythiophene derivatives. ChemPhysChem 8 (2007) 1623
A. Hattori, H. Sato and M. Vacha: Microscale polarity in polymer films probed by fluorescence of a benzanthrone derivative on ensemble and single-molecule level. Chem. Phys. Lett. 435 (2007) 311
Y. Koide, S. Takahashi and M. Vacha: Simultaneous two-photon excited fluorescence and one-photon excited phosphorescence from single molecules of an organometallic complex Ir(ppy)3. J. Am. Chem. Soc. 128 (2006) 10990
Y. Ebihara and M. Vacha: A method for determining the absorption ellipsoid of single conjugated polymer molecules and single luminescent nanoparticles. J. Chem Phys. 123 (2005) 244710
M. Vacha, J. Ha, Y. Ito, T. Shimada, J. M. Son and H. Sato: Excimer emission in electroluminescence and photoluminescence of polyfluorene derivatives: effects of local heating and exciton density. J. Appl. Phys. 97 (2005) 023514
M. Vacha, Y. Koide, M. Kotani and H. Sato: Single molecule detection and photobleaching study of a phosphorescent dye: organometallic iridium(III) complex. Chem. Phys. Lett. 388 (2004) 263
M. Vacha and M. Kotani: Three-dimensional orientation of single molecules observed by far-field and near-field fluorescence microscopy. J. Chem. Phys. 118 (2003) 5279
M. Vacha, M. Saeki, M. Furuki, L. S. Pu, K. Hashizume and T. Tani: Micro-spectroscopy of individual nanostructures of molecular aggregates: Relationship between morphology and optical properties. Chem. Phys. 285 (2002) 149
M. Vacha, M. Seaki, O. Isobe, K. Hashizume and T. Tani: Mapping the orientation of exciton transition dipoles along individual nanostructures of molecular J-aggregates. J. Chem. Phys. 115 (2001) 4973
M. Vacha, M. Furuki, L.S. Pu and T. Tani: Individual J-aggregate nanostructures as self-assembled organic microcavities. J. Phys. Chem. B 105 (2001) 12226
F. Vacha, M. Vacha, L. Bumba, K. Hashizume and T. Tani: Inner structure of intact chloroplasts observed by a low temperature laser scanning microscope. Photosynthetica 38 (2000) 493
M. Vacha, S. Takei, K. Hashizume, Y. Sakakibara and T. Tani: Onset of exciton-polariton behavior observed in individual fibers of pseudoisocyanine J-aggregates by sub-micron scale reflectance spectroscopy. Chem. Phys. Lett. 331 (2000) 387
M. Vacha, H. Yokoyama, T. Tokizaki, M. Furuki, T. Tani: Laser scanning microscope for low temperature single molecule and micro-scale spectroscopy based on gradient index optics. Rev. Sci. Instrum. 70 (1999) 2041
M. Vacha, M. Furuki and T. Tani: Origin of the long wavelength fluorescence band in some preparations of J-aggregates: Low temperature fluorescence and hole burning study. J. Phys. Chem. B 102 (1998) 1916
M. Vacha, Y. Liu, H. Nakatsuka and T. Tani: Inhomogeneous and single molecule line broadening of terrylene in a series of crystalline n-alkanes. J. Chem. Phys. 106 (1997) 8324　
M. Vacha and T. Tani: Single molecule spectroscopy of benzo-diphenanthro-bisanthene in a Shpolskii matrix, J. Phys. Chem. A 101 (1997) 5027
M. Vacha, Y. Liu, J. Itoh, M. Komuro and T. Tani: Implementation of a selfoc lens for the light collection element for single molecule spectroscopy at cryogenic temperatures. Rev. Sci. Instrum. 68 (1997) 254
M. Vacha, S. Machida and K. Horie: Relaxations of the second excited state of zinc-tetraphenylporphyrin probed by spectral hole burning in the Soret absorption band: electron transfer vs. internal conversion. J. Phys. Chem. 99 (1995) 13163
M. Vacha, S. Machida and K. Horie: Spectral hole burning in the Soret absorption band of a zinc-tetrabenzoporphin derivative. Chem. Phys. Lett. 242 (1995) 169
J. Psencik, M. Vacha, F. Adamec, M. Ambroz, J. Dian, J. Bocek and J. Hala: Hole burning study of excited state structure and energy transfer dynamics of bacteriochlorophyll c in chlorosomes of green sulfur photosynthetic bacteria. Photosynth. Res. 42 (1994) 1
M. Vacha, J. Dian, F. Vacha, D. Sofrova and J. Hala: Persistent spectral hole burning in native Synechococcus antenna complexes. Photosynthetica 26 (1992) 593
M. Vacha, F. Adamec, M. Ambroz, V. Baumruk, J. Dian, L. Nedbal and J. Hala: Hole burning spectroscopy of active and inactivated photosystem II particles. Photochem. Photobiol. 54 (1991) 127

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