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
Institute of Materials Research, Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, 518055, China.
Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.
Light Sci Appl. 2025 Apr 9;14(1):156. doi: 10.1038/s41377-025-01817-x.
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 × 10 s in doped thin films. The Ph-OLEDs emit blue light with a peak wavelength of 485 nm and CIE coordinates of (0.175, 0.446), exhibiting a peak external quantum efficiencies (EQE) of 31.62% and brightness up to 214,255 cd m. Notably, they shown minimal efficiency roll-off, retaining an EQE of 27.76% at 10,000 cd m, and 20.58% at 100,000 cd m. 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 (LT, the time taken for luminance to decrease by 50%) reaching 1237 h at 1000 cd m, 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 20 nm and the CIEy of 0.233, achieving an EQE of 29.78% and LT of 318 h at 1000 cd m. We also fabricated the active-matrix (AM) blue Hyper-OLEDs with 400 pixels per inch to demonstrate their application in AM displays.
蓝色磷光有机发光二极管（Ph-OLED）长期以来在效率、稳定性和亮度方面面临着严峻挑战，而这些对于先进显示至关重要。在此，我们介绍了两种新型铱（III）发光体，其具有3,6-二（叔丁基）-9H-咔唑基（tBuCz）取代的三齿卡宾钳形配体，显著提高了效率和稳定性。tBuCz-m-CF3和tBuCz-p-CF3配合物旨在增强空间位阻并使激子积累最小化。这些创新带来了98%的出色光致发光量子产率（PLQY）以及掺杂薄膜中令人印象深刻的7.97×10 s的衰减速率常数。该Ph-OLED发出峰值波长为485 nm且CIE坐标为（0.175, 0.446）的蓝光，展现出31.62%的峰值外量子效率（EQE）以及高达214,255 cd m的亮度。值得注意的是，它们的效率滚降极小，在10,000 cd m时保持27.76%的EQE，在100,000 cd m时保持20.58%的EQE。在各种亮度水平下的这些一致性能代表了蓝色Ph-OLED技术的一个重要里程碑。这些器件还展现出令人印象深刻的稳定性，在1000 cd m时的工作寿命（LT，即亮度降低50%所需的时间）达到1237 h，为蓝色Ph-OLED设定了新的基准。为了提高色纯度，开发了半高宽（FWHM）为20 nm且CIEy为0.233的超OLED，在1000 cd m时实现了29.78%的EQE和318 h的LT。我们还制造了每英寸400像素的有源矩阵（AM）蓝色超OLED，以展示它们在AM显示器中的应用。
