期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 23, 页码 20812-20819出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04148
关键词
photon upconversion; triplet-triplet annihilation; near-infrared to visible; binary solid; solution casting; intersystem crossing; triplet energy transfer
资金
- MEXT, Japan [J1326107002, JP26107004]
- JSPS [JP16H02286]
Herein, triplet-triplet annihilation upconversion (TTA-UC) from near-infrared (NIR, 785 nm) to visible (yellow, centered at 570 nm) regions has been demonstrated in the binary solid of condensed chromophores. Microparticles of the binary solid comprising rubrene as a matrix (emitter) and pi-extended Pd-porphyrin as a dopant (sensitizer) in a mole ratio of 1000:1 were obtained by solution casting. Excitation intensity dependence and quantum yield (QY) of the upconverted emission were characterized for individual particles under a microscope and revealed a low threshold intensity (similar to 100 mW/cm(2)) as compared to the solution and moderate UC-QY (similar to 0.5%) in the NIR range. The factors contributing to the UC-QY were investigated by time-resolved and steady-state spectroscopies. It was found that the intersystem crossing of the sensitizer, triplet energy transfer, and TTA occurred efficiently in the binary solid, and the fluorescence QY of the emitter governed the UC-QY.
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