scholarly journals Simultaneously measured photoluminescence lifetime and quantum yield of two-photon cascade emission on single CdSe/ZnS nanocrystals

2017 ◽  
Vol 95 (24) ◽  
Author(s):  
Nao Hiroshige ◽  
Toshiyuki Ihara ◽  
Yoshihiko Kanemitsu
Keyword(s):  
Quantum Yield ◽  
Two Photon ◽  
Photoluminescence Lifetime ◽  
Zns Nanocrystals ◽  
Cascade Emission ◽  
Photon Cascade Emission

scholarly journals Controlling the Two-Photon-Induced Photon Cascade Emission in a Gd3+/Tb3+-Codoped Glass for Multicolor Display

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Mao-Hui Yuan ◽  
Hai-Hua Fan ◽  
Hui Li ◽  
Sheng Lan ◽  
Shao-Long Tie ◽  
...  
Keyword(s):  
Two Photon ◽  
Cascade Emission ◽  
Multicolor Display ◽  
Photon Cascade Emission

scholarly journals Two-Photon–NIR-II Antimicrobial Graphene-Nanoagent for Ultraviolet–NIR Imaging and Photoinactivation

2021 ◽  
Author(s):  
WEN-SHUO KUO ◽  
Chia-Yuan Chang ◽  
Ping-Ching Wu ◽  
Jiu-Yao Wang
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Chemical Modification ◽  
Near Infrared ◽  
Photon Absorption ◽  
Excitation Wavelength ◽  
Strong Electron ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Abstract BackgroundNitrogen doping and amino-group functionalization, which result in strong electron donation, can be achieved through chemical modification. Large π-conjugated systems of graphene quantum dot (GQD)-based materials acting as electron donors can be chemically manipulated with low two-photon excitation energy in a short photoexcitation time for improving the charge transfer efficiency of sorted nitrogen-doped amino acid–functionalized GQDs (sorted amino-N-GQDs). ResultsIn this study, a self-developed femtosecond Ti-sapphire laser optical system (222.7 nJ pixel−1 with 100-170 scans, approximately 0.65-1.11 s of total effective exposure times; excitation wavelength: 960 nm in the near-infrared II region) was used for chemical modification. The sorted amino-N-GQDs exhibited enhanced two-photon absorption, post-two-photon excitation stability, two-photon excitation cross-section, and two-photon luminescence through the radiative pathway. The lifetime and quantum yield of the sorted amino-N-GQDs decreased and increased, respectively. Furthermore, the sorted amino-N-GQDs exhibited excitation-wavelength-independent photoluminescence in the near-infrared region and generated reactive oxygen species after two-photon excitation. An increase in the size of the sorted amino-N-GQDs boosted photochemical and electrochemical efficacy and resulted in high photoluminescence quantum yield and highly efficient two-photon photodynamic therapy. ConclusionThe sorted dots can be used in two-photon contrast probes for tracking and localizing analytes during two-photon imaging in a biological environment and for conducting two-photon photodynamic therapy for eliminating infectious microbes.

scholarly journals Breaking the 1,2-HOPO barrier with a cyclen backbone for more efficient sensitization of Eu(iii) luminescence and unprecedented two-photon excitation properties

2019 ◽  
Vol 10 (17) ◽  
pp. 4550-4559 ◽  
Author(s):  
Lixiong Dai ◽  
Wai-Sum Lo ◽  
Yanjuan Gu ◽  
Qingwu Xiong ◽  
Ka-Leung Wong ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Breaking the barrier of 1,2 HOPO complexes with extremely emissive Eu-Cy-HOPO (overall quantum yield −30.2%) that displays two photon properties.

Acetylene bridged porphyrin–monophthalocyaninato ytterbium(iii) hybrids with strong two-photon absorption and high singlet oxygen quantum yield

2012 ◽  
Vol 41 (15) ◽  
pp. 4536 ◽  
Author(s):  
Hanzhong Ke ◽  
Wenbin Li ◽  
Tao Zhang ◽  
Xunjin Zhu ◽  
Hoi-Lam Tam ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

On the sensitization of the Pr3+ Photon Cascade Emission by the 4fn−15d1 states of the Tm3+ and Nd3+ ions in YF3

2013 ◽  
Vol 36 (2) ◽  
pp. 346-351 ◽  
Author(s):  
A.M. Srivastava ◽  
S.J. Camardello ◽  
H.A. Comanzo ◽  
T.J. Sommerer ◽  
F. Garcia-Santamaria ◽  
...  
Keyword(s):  
Cascade Emission ◽  
Photon Cascade Emission
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