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Blue iridium(III) complexes with high internal quantum efficiency based on 4-(pyridin-3-yl)pyrimidine derivative and their electroluminescent properties
Dyes and Pigments ( IF 4.1 ) Pub Date : 2020-02-04 , DOI: 10.1016/j.dyepig.2020.108257
Wei Cheng , Li-Ding Wang , Yue-Yue Zhou , Zu-Qiang Bian , Bi-Hai Tong , Zhi-Wei Liu , Song Wang

Three novel highly efficient blue bicyclometalated iridium(III) complexes (Ir1–Ir3) were designed and synthesized with 4-(2, 6-difluoropyridin-3-yl)-6-mesitylpyrimidine as primary ligands. The alternation of ancillary ligands had precisely regulated their emitting peaks from sky-blue to deep-blue. These complexes exhibit unimodal emission with PLQYs higher than 90% and lifetimes shorter than 1.1 μs. These complexes also show good thermal stability with Td > 320 °C. The OLED using complex Ir3 as emitter in 13 wt% exhibited a maximum luminous efficiency of 16.9 cd A−1 with a high EQE of 13.0%. The CIE coordinates of this device are (0.15, 0.16), which are close to the standard blue color region.



中文翻译:

基于4-(吡啶-3-基)嘧啶衍生物的具有高内部量子效率的蓝色铱(III)配合物及其电致发光性能

以4-(2,6-二氟吡啶-3-基)-6-间甲基嘧啶为主要配体,设计合成了三种新型的高效蓝色双环金属化铱(III)配合物(Ir1-Ir3)。辅助配体的交替精确地调节了它们的发射峰,从天蓝色到深蓝色。这些配合物表现出单峰发射,PLQYs高于90%,寿命短于1.1μs。这些配合物在T d  > 320°C时也显示出良好的热稳定性。以13wt%使用复合Ir3作为发射体的OLED显示出16.9cd A -1的最大发光效率和13.0%的高EQE。该设备的CIE坐标为(0.15,0.16),接近标准的蓝色区域。

更新日期:2020-02-04
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