Yan Zhi-Ping, Luo Xu-Feng, Liu Wei-Qiang, Wu Zheng-Guang, Liang Xiao, Liao Kang, Wang Yi, Zheng You-Xuan, Zhou Liang, Zuo Jing-Lin, Pan Yi, Zhang Hongjie
State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Chemistry. 2019 Apr 17;25(22):5672-5676. doi: 10.1002/chem.201900955. Epub 2019 Mar 27.
Chiral materials with circularly polarized luminescence (CPL) are potentially applicable for 3D displays. In this study, by decorating the pyridinyl-helicene ligands with -CF and -F groups, the platinahelicene enantiomers featured superior configurational stability, as well as high sublimation yield (>90 %) and clear CPPL properties, with dissymmetry factors (|g |) of approximately 3.7×10 in solution and about 4.1×10 in doped film. The evaporated circularly polarized phosphorescent organic light-emitting diodes (CP-PhOLEDs) with two enantiomers as emitters exhibited symmetric CPEL signals with |g | of (1.1-1.6)×10 and decent device performances, achieving a maximum brightness of 11 590 cd m , a maximum external quantum efficiency up to 18.81 %, which are the highest values among the reported devices based on chiral phosphorescent Pt complexes. To suppress the effect of reverse CPEL signal from the cathode reflection, the further implementation of semitransparent aluminum/silver cathode successfully boosts up the |g | by over three times to 5.1×10 .
具有圆偏振发光（CPL）的手性材料在3D显示方面具有潜在应用价值。在本研究中，通过用-CF和-F基团修饰吡啶基六螺烯配体，铂六螺烯对映体具有卓越的构型稳定性，以及高升华产率（>90%）和清晰的圆偏振磷光（CPPL）特性，在溶液中的不对称因子（|g|）约为3.7×10⁻³，在掺杂薄膜中约为4.1×10⁻³。以两种对映体作为发光体的蒸镀型圆偏振磷光有机发光二极管（CP-PhOLEDs）表现出对称的圆偏振电致发光（CPEL）信号，|g|为(1.1 - 1.6)×10⁻³，且器件性能良好，实现了11590 cd·m⁻²的最大亮度、高达18.81%的最大外量子效率，这是基于手性磷光铂配合物的已报道器件中的最高值。为抑制来自阴极反射的反向CPEL信号的影响，半透明铝/银阴极的进一步应用成功将|g|提高了三倍多，达到5.1×10⁻³。
