中国科学院长春应用化学研究所朱峰小组在研究中取得进展。他们开发出具有深蓝色发射的高效固溶晶体有机发光二极管。相关论文于2023年1月12日发表在《自然—光子学》杂志上。
研究人员报道了一种利用深蓝色荧光材料的有机固溶薄膜制备高性能C-OLEDs的方法。他们的C-OLED显示出强大的光子输出能力，具有高达6.5%的外部量子效率，国际照明委员会（CIE）色坐标约为（0.15, 0.07）。驱动电压(4.0V@1000cd m-2)、功率效率(3.9 lm W-1@1000cd m-2)和串联电阻焦耳-热损失比(11.1%@ 1000 cd m-2)优于深蓝非晶态OLED (CIEy≤0.08)，使其成为下一代OLED技术的一个有吸引力的方法。
据介绍，晶体有机半导体具有高度定向的跃迁偶极矩和载流子的高迁移率等优势，是先进有机固态发光器件的潜在吸引介质，这在原则上应该导致高效发光。然而，基于晶体有机半导体的有机发光二极管（C-OLEDs）到目前为止一直与设备性能不佳作斗争。
附：英文原文
Title: An efficient solid-solution crystalline organic light-emitting diode with deep-blue emission
Author: Sun, Peifu, Liu, Dan, Zhu, Feng, Yan, Donghang
Issue&Volume: 2023-01-12
Abstract: Crystalline organic semiconductors are potentially attractive media for advanced organic solid-state light-emitting devices due to their advantageous highly oriented transition dipole moments and high mobility of charge carriers, which should in principle lead to efficient light emission; however, crystalline organic semiconductor-based organic light-emitting diodes (C-OLEDs) have until now struggled with poor device performance. Here we report a method to create high-performance C-OLEDs by using organic solid-solution thin films of deep-blue fluorescent materials. Our C-OLED exhibits a strong photon output capacity and has an external quantum efficiency of up to 6.5% with Commission Internationale de L’Eclairage (CIE) colour coordinates of around (0.15, 0.07). The driving voltage (4.0V@1,000cdm–2), power efficiency (3.9lmW–1@1,000cdm–2) and series-resistance joule-heat loss ratio (11.1%@1,000cdm–2) outperform deep-blue amorphous OLEDs (CIEy≤0.08), making it an attractive approach for next-generation OLED technologies.
DOI: 10.1038/s41566-022-01138-0
Source: https://www.nature.com/articles/s41566-022-01138-0