Solid-State, Near-Infrared to Visible Photon Upconversion via Triplet-Triplet Annihilation of a Binary System Fabricated by Solution Casting

被引：58

作者：

Abulikemu, Aizitiaili ^{[1
,6
]}

Sakagami, Yusuke ^{[1
]}

Heck, Claire ^{[1
]}

Kamada, Kenji ^{[1
]}

Sotome, Hikaru ^{[2
,3
]}

Miyasaka, Hiroshi ^{[2
,3
]}

Kuzuhara, Daiki ^{[4
]}

Yamada, Hiroko ^{[5
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, IFMRI, Ikeda, Osaka 5638577, Japan

[2] Osaka Univ, Grad Sch Engn Sci, Div Frontier Mat Sci, Toyonaka, Osaka 5608531, Japan

[3] Osaka Univ, Grad Sch Engn Sci, Ctr Adv Interdisciplinary Res, Toyonaka, Osaka 5608531, Japan

[4] Iwate Univ, Dept Phys Sci & Mat Engn, Morioka, Iwate 0208551, Japan

[5] Nara Inst Sci & Technol NAIST, Grad Sch Mat Sci, Ikoma, Nara 6300192, Japan

[6] Yamagata Univ, Innovat Ctr Organ Elect, Yonezawa, Yamagata 9920119, Japan

来源：

ACS APPLIED MATERIALS & INTERFACES | 2019年 / 11卷 / 23期

关键词：

photon upconversion; triplet-triplet annihilation; near-infrared to visible; binary solid; solution casting; intersystem crossing; triplet energy transfer; LOW-POWER; QUANTUM YIELDS; FLUORESCENCE; SENSITIZERS; EXCITATION;

D O I：

10.1021/acsami.9b04148

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：20812 / 20819

页数：8

共 36 条

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