Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 35, Pages 29840-29847Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b09418
Keywords
white organic light-emitting diodes; gradient exciplex; power efficiency; spiro materials; low roll-off
Funding
- National Key R&D Program of China [2016YFB0400700]
- Collaborative Innovation Centre of Suzhou Nano Science and Technology (Nano-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
- Yunnan Provincial Research Funds on College-Enterprise Collaboration
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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 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.
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