New triphenylamine-based iridium(III) dendritic complexes are demonstrated as active components for white polymer light-emitting diodes (WPLEDs). Initially the orange PLEDs are fabricated through dispersing the dendrimers into PVK in the presence of an electron-transport material 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD). High performance of orange PLEDs is acquired by use of the low-conductivity anode buffer layer P8000, with the maximum current/power/external quantum efficiencies of 52.4 cd A−1/21.6 lm W−1/21.0%. Based on the excellent performance of the orange PLEDs, single-layer white polymer light-emitting devices (WPLEDs) are fabricated by double-doping sky-blue emitter iridium(III) bis(2-(4,6-difluorophenyl)-pyridinato-N,C2)picolinate (FIrpic) and the orange iridium dendrimers. These WPLEDs achieve the maximum current/power/external quantum efficiencies of 37.0 cd A−1/19.4 lm W−1/18.5%, which are among the highest efficiencies for dual-color WPLEDs ever reported. This work presents a premiere attempt on applying dendritic phosphor in highly efficient all-phosphor WPLEDs and a step forward to panchromatic application of Ir(III) dendrimers.
新型
三苯胺基
铱(III)树枝状配合物被证明可作为白色聚合物发光二极管(WPLED)的活性成分。首先,在电子传递材料 2-
叔丁基苯基-5-
联苯-1,3,4-恶二唑(
PBD)的存在下,将树枝状聚合物分散到 PVK 中,制成橙色 PLED。通过使用低导电率阳极缓冲层 P8000,橙色发光二极管获得了高性能,最大电流/功率/外部量子效率为 52.4 cd A-1/21.6 lm W-1/21.0%。在橙色发光二极管优异性能的基础上,通过双掺杂天蓝色发光体双(2-(4,6-二
氟苯基)-
吡啶-N,C2)
吡啶甲酸铱(III)(FIrpic)和橙色
铱树枝状聚合物,制备了单层白色聚合物发光器件(WPLED)。这些 WPLED 的最大电流/功率/外部量子效率达到 37.0 cd A-1/19.4 lm W-1/18.5%,是目前报道的双色 WPLED 效率最高的产品之一。这项工作是将树枝状荧光粉应用于高效全荧光 WPLED 的首次尝试,也为 Ir(III)树枝状聚合物的全色应用迈出了一步。