期刊
ACS MATERIALS LETTERS
卷 -, 期 -, 页码 664-672出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.2c01170
关键词
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A novel through-space conjugated molecule (2,3-PICz-XT) with dual delayed fluorescence and room-temperature phosphorescence is developed, which exhibits short phosphorescence lifetimes and high photoluminescence quantum yields. 2,3-PICz-XT functions as an efficient emitter and sensitizer in OLEDs, achieving high external quantum efficiencies and improved EL performances.
Purely organic materials with room-temperature phos-phorescence usually have much longer triplet state lifetimes than noble -metal containing phosphorescent materials, which lead to severe exciton quenching and inferior electroluminescence (EL) performance when applied in organic light-emitting diodes (OLEDs). Herein, a novel through-space conjugated molecule (2,3-PICz-XT) with dual delayed fluorescence and room-temperature phosphorescence is developed. Owing to suitable energy levels and strong spin-orbit coupling among excited states, 2,3-PICz-XT has short phosphorescence lifetimes at microsecond scale and high photoluminescence quantum yields in neat and doped films. 2,3-PICz-XT can function as efficient emitters in OLEDs, providing high external quantum efficiencies (eta exts) of up to 32.73% with small efficiency roll-offs. It can also efficiently sensitize various phosphorescent and thermally activated delayed fluorescence (TADF) materials to yield excellent EL performances. Impressively, the hyperfluorescence OLEDs using 2,3-PICz-XT as sensitizer for multiple resonance TADF materials attain narrow EL spectra and greatly improved eta exts over 35%. To the best of our knowledge, 2,3-PICz-XT is the most efficient emitter and sensitizer ever reported for dual delayed fluorescence and phosphorescence materials.
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