Color-Tunable Resonant Photoluminescence and Cavity-Mediated Multistep Energy Transfer Cascade

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• 作者：Daichi Okada ; Takashi Nakamura ; Daniel Braam ; Thang Duy Dao ; Satoshi Ishii ; Tadaaki Nagao ; Axel Lorke ; Tatsuya Nabeshima ; Yohei Yamamoto
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：July 26, 2016
• 年：2016
• 卷：10
• 期：7
• 页码：7058-7063
• 全文大小：385K
• 年卷期：0
• ISSN：1936-086X

文摘

Color-tunable resonant photoluminescence (PL) was attained from polystyrene microspheres doped with a single polymorphic fluorescent dye, boron-dipyrrin (BODIPY) 1. The color of the resonant PL depends on the assembling morphology of 1 in the microspheres, which can be selectively controlled from green to red by the initial concentration of 1 in the preparation process of the microspheres. Studies on intersphere PL propagation with multicoupled microspheres, prepared by micromanipulation technique, revealed that multistep photon transfer takes place through the microspheres, accompanying energy transfer cascade with stepwise PL color change. The intersphere energy transfer cascade is direction selective, where energy donor-to-acceptor down conversion direction is only allowed. Such cavity-mediated long-distance and multistep energy transfer will be advantageous for polymer photonics device application.