Discovery of Key TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light**

Naoyuki Harada, Yoichi Sasaki, Masanori Hosoyamada, Nobuo Kimizuka, Nobuhiro Yanai

Research output: Contribution to journalArticlepeer-review

Abstract

While many studies have been done on triplet–triplet annihilation-based photon upconversion (TTA-UC) to produce visible light with high efficiency, the efficient TTA-UC from visible to UV light, despite its importance for a variety of solar and indoor applications, remains a challenging task. Here, we report the highest visible-to-UV TTA-UC efficiency of 20.5 % based on the discovery of an excellent UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph). TIPS-Nph is an acceptor with desirable features of high fluorescence quantum yield and high singlet generation efficiency by TTA. TIPS-Nph has a low enough triplet energy level to be sensitized by Ir(C6)2(acac), a superior donor that does not quench UV emission. The combination of TIPS-Nph and Ir(C6)2(acac) realizes the efficient UV light production even with weak light sources such as an AM 1.5 solar simulator and room LEDs.

Original languageEnglish
Pages (from-to)142-147
Number of pages6
JournalAngewandte Chemie - International Edition
Volume60
Issue number1
DOIs
Publication statusPublished - Jan 4 2021

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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