Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 22, Pages 7141-7147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02885
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Funding
- National Key Research and Development Plan [2016YFB0401004]
- Open Fund of Beijing National Laboratory for Molecular Sciences (BNLMS) [BNLMS20160131]
- Fundamental Research Funds for the Central Universities (Harbin Institute of Technology)
- NSRIF [.2020001]
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Achieving efficient ultralong purely organic phosphorescent luminophores is still a big challenge due to the slow intersystem crossing (ISC) process. Herein, we present a facile molecular design strategy that incorporates a secondary group (Br atom or methoxy group) into o-BrCz that can significantly enhance the ISC rate constant (k(ISC)) and achieve high phosphorescence quantum yields (Phi(p)). As a result, DBrCz and MeBrCz achieved a profound increase of k(ISC) approximate to 10(8) s(-1) and obtained excellent Phi(p) values up to 24.53 and 27.81% in solid powder, respectively. Given the highly efficient Phi(p) and proper tau(p), DBrCz and MeBrCz are applied to alternating current (AC) light-emitting diodes (LEDs), achieving a white LED with CIE coordinates (0.28, 0.29) and a CRI over 90. As a proof of concept, we demonstrate its compensation effect on the dark duration of AC-LED with a reduced percent flicker of 78%. This result extends a new potential application for RTP luminophores in the lighting field.
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