Harnessing Metal Cluster Sensitizers for Triplet-Triplet Annihilation Photon Upconversion: Strategies for Performance Enhancement

Yoshiki Niihori and Masaaki Mitsui* 

Recent Advances in Understanding Triplet States in Metal Nanoclusters: Their Formation, Energy Transfer, and Applications in Photon Upconversion

Masaaki Mitsui* 

Geometric and Electronic Properties of P Atom-Doped Al Nanoclusters: Alkaline-like Superatom of P@Al12

M. Akutsu, K. Koyasu, K. Miyajima, M. Mitsui, T. Inoue, and A. Nakajima*

Tailoring sensitization properties and improving near-infrared photon upconversion performance through alloying in superatomic molecular Au25 nanoclusters 

M. Mitsui,* Y. Miyoshi, and D. Arima

Triplet-Mediator Ligand-Protected Metal Nanocluster Sensitizers for Photon Upconversion

D. Arima, S. Hidaka, S. Yokomori, Y. Niihori, Y. Negishi, R. Oyaizu, T. Yoshinami, K. Kobayashi,* and M. Mitsui* 

Triplet Properties and Intersystem Crossing Mechanism of PtAg28 Nanocluster Sensitizers Achieving Low Threshold and Efficient Photon Upconversion

M. Mitsui* and A. Uchida

Dissecting Triplet-State Properties and Intersystem Crossing Mechanism of the Ligand-Protected Au13 Superatom

K. Yoshida, D. Arima, and M. Mitsui*

Nested Keplerian Architecture of [Cu58H20(SPr)36(PPh3)8]2+ Nanocluster 

S. Biswas, S. Hossain, T. Kosaka, J. Sakai, D. Arima, Y. Niihori, M. Mitsui, D.-e. Jiang, S. Das,* S. Wang,* and Y. Negishi*

Structurally Flexible Au–Cu Alloy Nanoclusters Enabling Efficient Triplet Sensitization and Photon Upconversion

D. Arima and M. Mitsui*

Charge-Transfer-Mediated Mechanism Dominates Oxygen Quenching of Ligand-Protected Noble-Metal Cluster Photoluminescence

M. Mitsui*, D. Arima, A. Uchida, K. Yoshida, Y. Arai, K. Kawasaki, and Y. Niihori

On the Origin of Photoluminescence Enhancement in Biicosahedral AgxAu25-x Nanoclusters (x = 0–13) and Their Application to Triplet–Triplet Annihilation Photon Upconversion

M. Mitsui*, D. Arima, Y. Kobayashi, E. Lee, and Y. Niihori

Evidence for Triplet-State-Dominated Luminescence in Biicosahedral Superatomic Molecular Au25 Clusters

M. Mitsui*, Y. Wada, R. Kishii, D. Arima, and Y. Niihori

Unravelling the Origin of Dual Photoluminescence in Au2Cu6 Clusters by Triplet Sensitization and Photon Upconversion

D. Arima, Y. Niihori, and M. Mitsui*

Excited-State Symmetry Breaking in a Multiple Multipolar Chromophore Probed by Single-Molecule Fluorescence Imaging and Spectroscopy

M. Mitsui,* Y. Takakura, K. Hirata, Y. Niihori, Y. Fujiwara, and K. Kobayashi 

Starburst-Shaped D-π-A Chromophores Possessing a Hexaethynylbenzene Core for Dye-Sensitized Solar Cells 

M. Mitsui*, Y. Nakagome, Y. Niihori, S. Inoue, Y. Fujiwara, and K. Kobayashi* 

Single Platinum Atom Doping to Silver Clusters Enables Near-infrared-to-Blue Photon Upconversion  

Y. Niihori, Y. Wada, and M. Mitsui*  

Synthesis and Properties of a Cyclohexa-2,7-Anthrylene Ethynylene Derivative  

H. Matsuki, K. Okubo, Y. Takaki, Y. Niihori, M. Mitsui,* E. Kayahara, S. Yamago,* and K. Kobayashi*  

Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy 

 M. Mitsui,* K. Mori, R. Kobayashi  

Photophysical and Thermodynamic Properties of Ag29(BDT)12(TPP)x (x = 0-4) Clusters in Secondary Ligand Binding-Dissociation Equilibria Unraveled by Photoluminescence Analysis  

Y. Niihori, N. Takahashi, and M. Mitsui,* 

Excited-State Symmetry Breaking of a Symmetrical Donor-π-Donor Quadrupolar Molecule at a Polymer/Glass Interface 

M. Mitsui,* Y. Takakura, Y. Niihori, M. Nakamoto, Y. Fujiwara, and K. Kobayashi* 

Impacts of Environmental Rigidity on Photophysical Characteristics and Behaviors of a Quadrupolar Chromophore Revealed by Single-Molecule Fluorescence Spectroscopy  

T. Mizukami, S. Inoue, H. Ohsawa, Y. Niihori, K. Kobayashi,* and M. Mitsui* 

Geometric and electronic properties of Si-atom doped Al clusters: Robustness of binary superatoms against charging 

M. Akutsu, K. Koyasu, J. Atobe, K. Miyajima, M. Mitsui, H.Tsunoyama, and A. Nakajima* 

Electronic Spectra and Excited-State Dynamics of Acridine and Its Hydrated Clusters 

C. Harthcock, J. Zhang, W. Kong,* M. Mitsui, and Y. Ohshima* 

Methodology for Discriminating Between Competitive Photophysical Processes in Photoblinking: Application to the Fluorescence Blinking of Single Dye Molecules Adsorbed on TiO2 

M. Mitsui,* A. Unno, and K. Mori

Single-Molecule Fluorescence Spectroscopy of Perylene Diimide Dyes in a γ-Cyclodextrin Film: Manifestation of Photoinduced H-Atom Transfer via Higher Triplet (n, π*) Excited States 

M. Mitsui,* H. Fukui, R. Takahashi, Y. Takakura, and T. Mizukami 

Effects of Supramolecular Encapsulation on Photophysics and Photostability of a 9,10-Bis(arylethynyl)anthracene-Based Chromophore Revealed by Single-Molecule Fluorescence Spectroscopy 

M. Mitsui,* K. Higashi, Y. Hirumi, and K. Kobayashi 

Synthesis and Self-assembly of Cyclic 2,7-Anthrylene Ethynylene 1,3-Phenylene Ethynylene Trimer with a Planar Conformation 

Y. Takaki, R. Ozawa, T. Kajitani, T. Fukushima, M. Mitsui, and K. Kobayashi* 

Understanding Photoinduced Charge Transfer Dynamics of Single Perylenediimide Dyes in a Polymer Matrix by Bin-time Dependence of Their Fluorescence Blinking Statistics 

M. Mitsui,* A. Unno, and S. Azechi 

Correlations Between Photovoltaic Characteristics, Adsorption Number, and Regeneration Kinetics in Dye-Sensitized Solar Cells Revealed by Scanning Photocurrent Microscopy  

M. Mitsui,* Y. Kawano, K. Mori, and N. Wakabayashi 

Enhanced Photostability of an Anthracene-Based Dye due to Supramolecular Encapsulation: A New Type of Photostable Fluorophore for Single-Molecule Study   

M. Mitsui,* K. Higashi, R. Takahashi, Y. Hirumi, and K. Kobayashi 

Formation and Electronic Structures of Organoeuropium Sandwich Nanowires 

N. Hosoya, R. Takegami, J. Suzumura, K. Yada, K. Miyajima, M. Mitsui, M. B. Knickelbein, S. Yabushita, and A. Nakajima* 

Encapsulation with Protrusion of Cruciform 9,10-Bis(arylethynyl)anthracene Derivertives in a Self-Assembled Boronic Ester Cavitand Capsule: Photochemical and Photophysical Properties 

Y. Hirumi, K. Tamaki, T. Namikawa, K. Kamada,* M. Mitsui, K. Suzuki, and K. Kobayashi* 

Electronic Energy Transfer in Tetracene-Doped p-Terphenyl Nanoparticles: Extraordinarily High Fluorescence Enhancement and Quenching Efficiency 

M. Mitsui,* Y. Kawano 

Photophysics and Photostability of 9,10-Bis(Phenylethynyl)Anthracene Revealed by Single-Molecule Spectroscopy  

M. Mitsui,* Y. Kawano, R. Takahashi, H. Fukui 

Development of a Simple Sample Holder for Variable-Temperature Single-Molecule Fluorescence Spectroscopy 

M. Mitsui,* Y. Kawano, R. Takahashi, H. Fukui 

Characterization of alkyl monolayer covalently bonded to Si(111) and soft-landing of vanadium-benzene sandwich clusters onto the alkyl monolayer substrate  

T. Matsumoto, S. Nagaoka, K. Ikemoto, M. Mitsui, M. Ara, H. Tada, and A. Nakajima* 

An atomic force microscope study of vanadium-benzene sandwich clusters soft-landed on self-assembled monolayers   

S. Nagaoka, K. Ikemoto, K. Fujio, K. Hiehata, A. Sasahara, M. Mitsui, H. Onishi, and A. Nakajima* 

Soft-landing experiments of Cr(benzene)2 sandwich complexes onto a carboxyl-terminated self-assembled monolayer matrix  

K. Ikemoto, S. Nagaoka, T. Matsumoto, M. Mitsui, and A. Nakajima* 

Soft-landing isolation of gas-phase synthesized transition metal-benzene complexes into a fluorinated self-assembled monolayer matrix 

S. Nagaoka, K. Ikemoto T. Matsumoto, M. Mitsui, and A. Nakajima* 

Mass spectrometry and photoelectron spectroscopy of o-, m-, and p-terphenyl cluster anions: the effect of molecular shape on molecular assembly and ion core character 

M. Mitsui, N. Ando, and A. Nakajima* 

Photoelectron spectroscopy of cluster anions of naphthalene and related aromatic hydrocarbons 

N. Ando, M. Mitsui, and A. Nakajima* 

Photoelectron spectroscopy of cluster anions of naphthalene and related aromatic hydrocarbons 

N. Ando, M. Mitsui, and A. Nakajima* 

Thermal and hyperthermal collision-energy depositions of transition metal-benzene sandwich complexes onto a self-assembled n-octadecanethiol monolayer 

S. Nagaoka, K. Ikemoto, T. Matsumoto, M. Mitsui, and A. Nakajima* 

Mass spectroscopic study of metal-rich K2-5(KI)n+ nanoclusters 

S. H. Huh, H.S. Jeong, K. Koyasu, K. Miyajima, M. Mitsui, and A. Nakajima* 

Comprehensive photoelectron spectroscopic study of anionic clusters of anthracene and its alkyl derivatives: Electronic structures bridging molecules to bulk 

N. Ando, M. Mitsui, and A. Nakajima* 

Mass spectrometry and photoelectron spectroscopy of tetracene cluster anions, (tetracene)n- (n = 1-100): Evidence for the highly localized nature of polarization in a cluster analogue of oligoacene crystals 

M. Mitsui, N. Ando, and A. Nakajima* 

Formation of large molecular cluster anions and elucidation of their electronic structures 

M. Mitsui* and A. Nakajima* 

Soft-landing Isolation of multidecker V2(benzene)3 complexes in an organic monolayer matrix: an infrared spectroscopy and thermal desorption study 

S. Nagaoka, T. Matsumoto, K. Ikemoto, M. Mitsui, and A. Nakajima* 

Electronic properties of Si- and Ge-atom doped In clusters; InnSim and InnGem 

M. Akutsu, K. Koyasu, J. Atobe, K. Miyajima, M. Mitsui, and A. Nakajima* 

Fabrication and characterization of a granular film consisting of size-selected silver nanoparticles: Application to a SERS substrate 

S. Kawabata, N. Ishikawa, M. Mitsui, and A. Nakajima* 

Electronic and geometric stabilities of clusters with transition metal encapsulated by silicon 

K. Koyasu, J. Atobe, M. Akutsu, M. Mitsui, and A. Nakajima* 

Experimental and theoretical characterization of aluminum-based binary superatoms of Al12X and their cluster salts 

M. Akutsu, K. Koyasu, J. Atobe, N. Hosoya, K. Miyajima, M. Mitsui, and A. Nakajima* 

Adiabatic electron affinities of oligophenyls: Anion photoelectron spectroscopy and density functional theory study  

T. Nakamura, N. Ando, Y. Matsumoto, S. Furuse, M. Mitsui, and A. Nakajima* 

Room-temperature isolation of V(benzene)2 sandwich clusters via soft-Landing into n-alkanethiol self-assembled monolayers 

S. Nagaoka, T. Matsumoto, E. Okada, M. Mitsui, and A. Nakajima* 

Photoelectron spectroscopy of binary Au cluster anions with doped metal of M = Pd, Ni, Zn, Cu, and Mg: AunM- (n = 2-7) 

K. Koyasu, Y. Naono, M. Akutsu, M. Mitsui, and A. Nakajima* 

Electronic properties of Cs-atom doped aluminum and silicon clusters: AlnCsm and SinCsm 

K. Koyasu, M. Akutsu, J. Atobe, M. Mitsui, and A. Nakajima* 

Soft-landing isolation of vanadium-benzene sandwich clusters on a room-temperature substrate using n-alkanethiolate self-assembled monolayer matrices 

M. Mitsui, S. Nagaoka, T. Matsumoto, and A. Nakajima* 

Formation and photoelectron spectroscopy of nanoscale cluster anions of biphenyl, (BP)n- (n = 2-100) 

M. Mitsui, Y. Matsumoto, N. Ando, and A. Nakajima*  

Negative ion photoelectron spectroscopy of 2,2’-bithiophene cluster anions, (2T)n- (n = 1-100) 

M. Mitsui, Y. Matsumoto, N. Ando, and A. Nakajima* 

Trapping of V(benzene)2 sandwich clusters in a n-alkanethiol self-assembled monolayer matrix 

S. Nagaoka, E. Okada, S. Doi, M. Mitsui, and A. Nakajima* 

Selective formation of MSi16 (M = Sc, Ti, and V) 

K. Koyasu, M. Akutsu, M. Mitsui, and A. Nakajima* 

Lanthanide organometallic sandwich nanowires: formation mechanism 

N. Hosoya, R. Takegami, J. Suzumura, K. Yada, K. Koyasu, K. Miyajima, M. Mitsui, M. B. Knickelbein, S. Yabushita, and A. Nakajima*  

Negative ion photoelectron spectroscopy of acridine molecular anion and its monohydrate 

S. Kokubo, N. Ando, K. Koyasu, M. Mitsui, and A. Nakajima* 

Coexistence of two different anion states in polyacene nanocluster anions 

M. Mitsui, S. Kokubo, N. Ando, Y. Matsumoto, A. Nakajima,* K. Kaya 

Electronic structures of exohedral lanthanide-C60 clusters 

J. Suzumura, N. Hosoya, S. Nagao, M. Mitsui, A. Nakajima* 

Photoelectron spectroscopy of pyrene cluster anions, (pyrene)n- (n = 1-20) 

N. Ando, S. Kokubo, M. Mitsui, and A. Nakajima* 

Unusually large dynamic electron polarization in an O2(1Δg)-2,2,6,6-tetramethyl piperidine-1-oxyl radical system 

M. Mitsui, K. Takeda, Y. Kobori, A. Kawai, and K. Obi*  

Quenching mechanism of excited coronene by a nitroxide radical studied by probing dynamic electron polarization 

M. Mitsui, Y. Kobori, A. Kawai, and K. Obi* 

Coexistence of solvated electrons and solvent valence anions in negatively charged acetonitrile clusters, (CH3CN)n- (n = 10-100) 

M. Mitsui, N. Ando, S. Kokubo, A. Nakajima,* and K. Kaya 

Negative ion photoelectron spectroscopy of (benzene)n- (n = 53-124) and (toluene)n- (n =33-139): Solvation energetics of an excess electron in size-selected aromatic hydrocarbon nanoclusters  

M. Mitsui, A. Nakajima,* and K. Kaya 

Photoelectron spectroscopy of palladium-doped gold cluster anions; AunPd- (n = 1-4) 

K. Koyasu, M. Mitsui, A. Nakajima,* and K. Kaya 

Mass spectra and photoelectron spectroscopy of negatively charged benzene clusters, (benzene)n- (n = 53-124)   

M. Mitsui, A. Nakajima,* K. Kaya, and U. Even 

Time resolved ESR study on the photochemical reactions of pyrene and nitroxide radical system in micelle; Formation of spin-correlated pyrene cation-nitroxide pairs   

A. Kawai, A. Shikama, M. Mitsui, and K. Obi* 

Structure and dynamics of 9(10H)-acridone and its hydrated clusters. III. Microscopic solvation effects on nonradiative dynamics 

M. Mitsui, Y. Ohshima,* and O. Kajimoto  

Structure and dynamics of 9(10H)-acridone and its hydrated clusters. II. Structural characterization of hydrogen-bonding networks 

M. Mitsui, Y. Ohshima*, S. Ishiuchi, M. Sakai, and M. Fujii 

Structure and dynamics of 9(10H)-acridone and its hydrated clusters. I. Electronic spectroscopy    

M. Mitsui and Y. Ohshima*  

Structural characterization of the acridine-(H2O)n (n = 1-3) clusters by fluorescence -detected infrared spectroscopy  

M. Mitsui, Y. Ohshima,* S. Ishiuchi, M. Sakai, and M. Fujii 

The first observation of CIDEP generated through the interaction between an excited singlet oxygen molecule and a free radical   

M. Mitsui, K. Takeda, Y. Kobori, A. Kawai, and K. Obi* 

Absolute magnitude of spin polarization in the radical-triplet pair mechanism: CIDEP generation by level crossings in a triplet-doublet interaction   

Y. Kobori, M. Mitsui, A. Kawai, and K. Obi* 

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