Yu Ye, Cao Chen, Wu Zhijun, Wu Qihui, Lin Wenyan, Peng Xuekang, Jin Yu, Zhang Xining, Yang Huishan, Tong Qingxiao
Opt Lett. 2019 Feb 15;44(4):931-934. doi: 10.1364/OL.44.000931.
We realized an efficient spectra-stable tandem white organic light-emitting device (WOLED) with pleasurable warm white emission and an extremely high color-rendering index (CRI) simultaneously by connecting a fluorescent blue unit and a phosphorescent dual-color unit via an easy-fabrication charge generation unit (CGU). Over a wide range of driving current density, the tandem warm white OLED exhibited general CRI (R) value exceeding 85 and special CRI (R) value close to 57. In addition, Duvs are within the tolerance for CRI measurements, ensuring validity and logicality of the calculated results concerning R and R. The obtained tandem OLED showed the maximum efficiencies of 38 cd/A and 22.9 lm/W, and still maintained high efficiencies of 35.5 cd/A and 17.2 lm/W at the luminance of 1000 cd/m. Moreover, we studied the origins of both extreme color stability in dual-color OLED and extremely efficient electron injection within the CGU. To the best of our knowledge, this is the first report regarding quantitative values of both R and the Duv for a high-Ra tandem WOLED.
通过一个易于制造的电荷产生单元（CGU）连接一个荧光蓝色单元和一个磷光双色单元，我们同时实现了一种高效的光谱稳定串联白色有机发光器件（WOLED），其发出令人愉悦的暖白色光且具有极高的显色指数（CRI）。在很宽的驱动电流密度范围内，串联暖白色OLED的一般显色指数（R）值超过85，特殊显色指数（R）值接近57。此外，色坐标偏差（Duvs）在CRI测量的公差范围内，确保了关于R和R的计算结果的有效性和逻辑性。所获得的串联OLED的最大效率分别为38 cd/A和22.9 lm/W，在亮度为1000 cd/m²时仍保持35.5 cd/A和17.2 lm/W的高效率。此外，我们研究了双色OLED中极端颜色稳定性和CGU内极其高效的电子注入的起源。据我们所知，这是关于高显色指数串联WOLED的R和Duv定量值的首次报道。
