清华大学韦国丹团队研究了高亮度和长寿命的高效蓝色OLED的可编程有源矩阵显示器。该项研究成果发表在2025年4月9日出版的《光：科学与应用》杂志上。

蓝色磷光OLED（Ph-OLED）长期以来在效率、稳定性和亮度方面面临着严峻的挑战，这对先进的显示至关重要。研究组介绍了两种新型Ir（III）发射体，其特征是3,6-二（叔丁基）-9H-咔唑基（tBuCz）取代的三齿卡宾钳配体，显著提高了效率和稳定性。tBuCz-m-CF3和tBuCz-p-CF3复合物旨在增强空间位阻并最大限度地减少激子积累。

这些创新使掺杂薄膜的光致发光量子产率（PLQY）达到98%，衰减速率常数达到7.97×105 s^-1。Ph OLED发出峰值波长为485 nm、CIE坐标为（0.175，0.446）的蓝光，其峰值外部量子效率（EQE）为31.62%，亮度高达214255 cd m⁻²。值得注意的是，它们显示出最小的效率衰减，在10000 cd m^-2时保持27.76%的EQE，在100000 cd m^-2下保持20.58%的EQE。

这些在不同亮度水平下的一致性能代表了蓝色Ph OLED技术的一个重要里程碑。这些器件还表现出令人印象深刻的稳定性，在1000 cd m⁻²的条件下，工作寿命（LT₅₀，亮度降低50%所需的时间）达到1237小时，为蓝色Ph OLED设定了新的基准。为了提高颜色纯度，开发了半峰全宽（FWHM）为20 nm、CIEy为0.233的超OLED，在1000 cd m⁻²下实现了29.78%的EQEm和318 h的LT₅₀。研究组还制造了每英寸400像素的有源矩阵（AM）蓝色超OLED，以展示其在AM显示器中的应用。

附：英文原文

Title: Exceptionally high brightness and long lifetime of efficient blue OLEDs for programmable active-matrix display

Author: Wu, Chengcheng, Tong, Kai-Ning, Shi, Kefei, He, Wei, Huang, Manli, Yan, Jie, Li, Siqi, Jin, Zhaoyun, Wang, Xin, Jung, Sinyeong, Ma, Jingrui, Zhuang, Yixi, Xie, Rong-Jun, Yu, Cunjiang, Meng, Hong, Sun, Xiao Wei, Yang, Chuluo, Chi, Yun, Kang, Feiyu, Wei, Guodan

Issue&Volume: 2025-04-09

Abstract: Blue phosphorescent OLEDs (Ph-OLEDs) have long faced critical challenges in efficiency, stability and brightness, which are crucial for advanced display. Herein, we introduce two novel Ir(III) emitters featuring a 3,6-di(tert-butyl)-9H-carbazolyl (tBuCz) substituted tridentate carbene pincer ligand, significantly improving efficiency and stability. The tBuCz-m-CF3 and tBuCz-p-CF3 complexes are designed to enhance steric encumbrance and minimize exciton accumulation. These innovations lead to exceptional photoluminescence quantum yields (PLQY) of 98% and an impressive decay rate constant of 7.97×105s1 in doped thin films. The Ph-OLEDs emit blue light with a peak wavelength of 485nm and CIE coordinates of (0.175, 0.446), exhibiting a peak external quantum efficiencies (EQE) of 31.62% and brightness up to 214,255cdm2. Notably, they shown minimal efficiency roll-off, retaining an EQE of 27.76% at 10,000cdm2, and 20.58% at 100,000cdm2. These consistent performances across various brightness levels represent a significant milestone for blue Ph-OLED technology. The devices also exhibit impressive stability, with an operational lifetime (LT50, the time taken for luminance to decrease by 50%) reaching 1237h at 1000cdm2, setting new benchmarks for blue Ph-OLEDs. To enhance the color purity, hyper-OLEDs were developed with a full width at half maximum (FWHM) of 20nm and the CIEy of 0.233, achieving an EQEm of 29.78% and LT50 of 318h at 1000cdm2. We also fabricated the active-matrix (AM) blue Hyper-OLEDs with 400 pixels per inch to demonstrate their application in AM displays.

DOI: 10.1038/s41377-025-01817-x

Source: https://www.nature.com/articles/s41377-025-01817-x