Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 31, Pages 16984-16988Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106472
Keywords
persistent luminescence; organic room temperature phosphorescence; two-photon ionization; white afterglow
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Funding
- National Natural Science Foundation of China [51773088, 21975119]
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In this work, organic long persistent luminescence (OLPL) materials with a duration of 20 to 40 minutes are achieved in a simple binary system based on a two-photon ionization mechanism. This system can simultaneously harvest excitons from both singlet and triplet excited states, making it a promising candidate for stable white OLPL. Through modulation and optimization of dopant molecules, the emission profiles of afterglow can be readily tuned to different shades of white with excellent color consistency.
Organic long persistent luminescence (OLPL) materials with afterglow duration in the scale of minutes or even hours are still rare. Most OLPL systems are based on exciplexes, which require complicated multi-component system in order to realize white afterglow but with slightly compromised duration and color stability. In this work, OLPLs lasting from 20 to 40 minutes are realized in a simple binary system based on two-photon ionization mechanism, which can simultaneously harvest excitons from both singlet and triplet excited states, making it potentially one of the most promising candidates to achieve stable white OLPL. Through modulation and optimization of dopant molecules in dibenzo[b,d]thiophen-2-yldiphenyl phosphine oxide host, the emission profiles of afterglow can be readily tuned from cyan (0.19, 0.22), cold white (0.31, 0.35), standard white (0.33, 0.33) to warm white (0.31, 0.46), with excellent color consistency.
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