Heavy Atom Effect of Selenium for Metal-Free Phosphorescent Light-Emitting Diodes,Chemistry of Materials

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Heavy Atom Effect of Selenium for Metal-Free Phosphorescent Light-Emitting Diodes
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-03-13 , DOI: 10.1021/acs.chemmater.0c00078
Dong Ryun Lee _{1,

2} , Kyung Hyung Lee ₁ , Wenhao Shao ₃ , Cho Long Kim ₁ , Jinsang Kim _{2,

3,

4,

5} , Jun Yeob Lee ₁

Affiliation

Room-temperature phosphorescence from metal-free purely organic molecules has recently gained much interest. We devised metal-free organic phosphors by incorporating selenium (Se) to promote spin–orbit coupling by its nonmetal heavy atom effect. The Se-based organic phosphors showed bright phosphorescent emission in organic light-emitting diodes (OLEDs) and photo-excited phosphorescence in an amorphous film state. Large orbital angular momentum change (ΔL) during the electron transition process and heavy atom effect of Se render a PL quantum yield of 0.33 ± 0.01 and a high external quantum efficiency (EQE) of 10.7 ± 0.14% in phosphorescent LEDs. This work demonstrates the rational molecular design of metal-free organic phosphorescent emitters with Se as an alternative novel class of materials to the conventional organometallic phosphors for OLEDs.

中文翻译：

硒对无金属磷光发光二极管的重原子效应

来自无金属的纯有机分子的室温磷光最近引起了人们的极大兴趣。我们通过掺入硒（Se）来设计无金属有机磷光体，以通过其非金属重原子效应促进自旋轨道耦合。硒基有机磷光体在有机发光二极管（OLED）中显示出明亮的磷光发射，并在非晶膜状态下显示出光激发磷光。大轨道角动量变化（ΔL）在电子跃迁过程中，Se的重原子效应使得磷光LED的PL量子产率为0.33±0.01，外部量子效率（EQE）为10.7±0.14％。这项工作证明了无金属有机磷光发光体的合理分子设计，其中Se作为OLED的常规有机金属磷光体的另一类新型材料。

更新日期：2020-03-16

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