High-Efficiency White Organic Light-Emitting Diodes Integrating Gradient Exciplex Allocation System and Novel D-Spiro-A Materials

Xun Tang, Xiang Yang Liu, Yi Yuan, Yong Jie Wang, Hong Cheng Li, Zuo Quan Jiang, Liang Sheng Liao

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

How to maintain high power efficiency (PE) and color stability under operating brightness is critical for the white organic light-emitting diodes (WOLEDs). To this end, two novel spiro-type materials STPy3 and STPy4 were designed. These materials could act as a single host and achieve a remarkable external quantum efficiency of 27.5% at 1000 cd m-2 to further optimize the PEs of OLEDs, STPy3/4 and PO-T2T were used as co-host-induced exciplexes, which enhanced the PE of green OLED to over 148.0 lm W-1. Unfortunately, the lower triplet energy level of exciplexes than blue emitters implied it is commonly unsuitable to fabricate WOLEDs. Herein, a new allocation of gradient exciplex (AGE) strategy was developed in which the formed excitons could be rationally allocated in a consequently doped nonuniform profile. The AGE incorporated the advantages of the exciplex with an ultralow turn-on voltage of 2.3 V and efficiency stability of spiro materials. The PE at 1000 cd m-2 was enhanced to 72.7 lm W-1, representing the first exciplex WOLED with the performance exceeding that of conventional fluorescent tubes.

Original languageEnglish
Pages (from-to)29840-29847
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number35
DOIs
Publication statusPublished - Sept 5 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science

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