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Efficient Persistent Room Temperature Phosphorescence in Organic Amorphous Materials under Ambient Conditions
Author(s) -
Hirata Shuzo,
Totani Kenro,
Zhang Junxiang,
Yamashita Takashi,
Kaji Hironori,
Marder Seth R.,
Watanabe Toshiyuki,
Adachi Chihaya
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201203706
Subject(s) - phosphorescence , quenching (fluorescence) , materials science , photochemistry , quantum yield , amorphous solid , exciton , fluorescence , organic chemistry , chemistry , optics , physics , quantum mechanics
Persistent emission with a long lifetime (>1 s) from organic materials can only be observed at a low temperature, because of the significant nonradiative deactivation pathway that occurs at room‐temperature (RT). If organic materials with persistent RT emission in air could be developed, they could potentially be utilized for a variety of applications. Here, organic host‐guest materials with efficient persistent RT phosphorescence (RTP) are developed by minimizing the nonradiative deactivation pathway of triplet excitons. The nonradiative deactivation pathway is dependent on both nonradiative deactivation of the guest and quenching by diffusional motion of the host. The rigidity and oxygen barrier properties of the steroidal compound used as the host suppressed the quenching, and the aromatic hydrocarbon used as the guest is highly deuterated to minimize nonradiative deactivation of the guest. Red‐green‐blue persistent RTP with a lifetime >1 s and a quantum yield >10% in air is realized for a pure organic material.