Highly Efficient Nondoped Green Organic Light-Emitting Diodes with Combination of High Photoluminescence and High Exciton Utilization

ACS Applied Materials & Interfaces
Chu WangYuguang Ma

Abstract

Photoluminescence (PL) efficiency and exciton utilization efficiency are two key parameters to harvest high-efficiency electroluminescence (EL) in organic light-emitting diodes (OLEDs). But it is not easy to simultaneously combine these two characteristics (high PL efficiency and high exciton utilization) into a fluorescent material. In this work, an efficient combination was achieved through two concepts of hybridized local and charge-transfer (CT) state (HLCT) and "hot exciton", in which the former is responsible for high PL efficiency while the latter contributes to high exciton utilization. On the basis of a tiny chemical modification in TPA-BZP, a green-light donor-acceptor molecule, we designed and synthesized CzP-BZP with this efficeient combination of high PL efficiency of η(PL) = 75% in the solid state and maximal exciton utilization efficiency up to 48% (especially, the internal quantum efficiency of η(IQE) = 35% substantially exceed 25% of spin statistics limit) in OLED. The nondoped OLED of CzP-BZP exhibited an excellent performance: a green emission with a CIE coordinate of (0.34, 0.60), a maximum current efficiency of 23.99 cd A(-1), and a maximum external quantum efficiency (EQE, η(EQE)) of 6.95%. This combined H...Continue Reading

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Citations

Jun 28, 2016·ACS Applied Materials & Interfaces·Jingwei Sun, Ziqi Liang
Jan 18, 2017·Physical Chemistry Chemical Physics : PCCP·Toshiaki EnokiYousuke Ooyama
Jul 4, 2017·Physical Chemistry Chemical Physics : PCCP·Paul KautnyFelix Plasser
Nov 25, 2020·Chemical Society Reviews·Yuwei XuYuguang Ma
Feb 1, 2019·Journal of the American Chemical Society·José Antônio do Nascimento NetoFelipe Terra Martins
May 16, 2019·ACS Applied Materials & Interfaces·Jayachandran JayakumarChien-Hong Cheng
May 7, 2019·ACS Applied Materials & Interfaces·Renli LiangChangqing Chen
Nov 30, 2021·The Journal of Organic Chemistry·Roberta KrügerDiego Alves

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