Rational Molecular Design for Achieving Persistent and Efficient Pure Organic Room-Temperature Phosphorescence

Weijun Zhao, Zikai He, Jacky W.Y. Lam, Qian Peng, Huili Ma, Zhigang Shuai, Gongxun Bai, Jianhua Hao, Ben Zhong Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

268 Citations (Scopus)

Abstract

Manipulation of the emission properties of pure organic room-temperature phosphors through molecular design is attractive but challenging. Tremendous efforts have been made to modulate their aggregation behaviors to suppress nonradiative decay in order to achieve efficient light emission and long lifetimes. However, success has been limited. To attain such a goal, here we present a rational design principle based on intrinsic molecular-structure engineering. Comprehensive investigations on the molecular orbitals revealed that an excited state with hybrid (n,π*) and (π,π*) configurations in appreciable proportion is desired. Tailoring the aromatic subunits in arylphenones can effectively tune the energy level and the orbital feature of the triplet exciton. Our experimental data reveal that a series of full-color pure organic phosphors with a balanced lifetime (up to 0.23 s) and efficiency (up to 36.0%) can be realized under ambient conditions, demonstrating the validity of our instructive design principle.
Original languageEnglish
Pages (from-to)592-602
Number of pages11
JournalChem
Volume1
Issue number4
DOIs
Publication statusPublished - 13 Oct 2016

Keywords

  • molecular design
  • persistent phosphorescence
  • room-temperature phosphorescence
  • structure-property relationship

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Biochemistry
  • Environmental Chemistry
  • Materials Chemistry
  • Biochemistry, medical

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