激基复合物作为黄绿光发射的高显色指数双色白光有机发光二极管

High CRI Two-Color White Organic Light-Emitting Diode Based on A Yellow-Green From Exciplex

同时实现简单结构、高显色指数(color rendering index,CRI)以及低成本的WOLED(white organic light-emitting diode,WOLED)具有很大的挑战。本研究采用m-MTDATA(4,4′,4″-tris[3-methylphenyl-(phenyl)aminotriphenylamine,m-MTDATA)和TPBi(2,2′,2″-(1,3,5-benzenetriyl)tris-[1-phenyl-1H-benzimidazole,TPBi)形成的发射光谱较宽的黄绿光激基发射,同时结合电子传输材料Bepp2(Bis[2-(2-hydroxyphenyl)-pyridine]beryllium,Bepp2)的蓝光发射,通过合理的器件结构设计实现激子在不同发光区域中的合理分布,最终实现了最大CRI为80、结构简单、且成本低的WOLED.这种新型的器件设计理念为发展结构简单、高性能的WOLED提供了好的指导,对于WOLED的商业化照明具有很强的现实意义。

White organic light-emitting diode（WOLED）is of growing interest because of its potential applications in full-color displays and solid-state lighting sources.Now,it is still a big challenge,for a simplified WOLED,to realize low cost and high color rendering index（CRI）simultaneously.In this work,by introducing a broad spectrum yellow-green exciplex（4,4′,4″-tris[3-methylphenyl-（phenyl）aminotriphenylamine,m-MTDATA：2,2′,2″-（1,3,5-benzenetriyl）tris-[1-phenyl-1H-benzimidazole,TPBi）,and combining a blue emission of the electron transport material（Bis[2-（2-hydroxyphenyl）-pyridine]beryllium,Bepp2）,a highly simplified two-color WOLED was fabricated.And a maximum CRI of 80 is achieved,which is attributed to a balanced distribution of excitons in different emissive zones via an artful device structure.Moreover,the simplified device structure also induces a low cost.This new design concept opens a new avenue for achieving high performance WOLEDs with simple structures,which has a great and deep reality-oriented meaning for commercial lighting of WOLEDs.