Facile Synthesis of Highly Efficient Lepidine-Based Phosphorescent Iridium(III) Complexes for Yellow and White Organic Light-Emitting Diodes
Facile Synthesis of Highly Efficient Lepidine-Based Phosphorescent Iridium(III) Complexes for Yellow and White Organic Light-Emitting Diodes
复制标题
轻松合成用于黄色和白色有机发光二极管的高效 Lepidine 基磷光铱 (III) 配合物
DOI：
10.1002/adfm.201503826
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发表时间：
2016-02-09
影响因子：
19
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
Tao, Peng;Li, Wei-Ling;Huang, Wei
以2，4-戊二酮或三唑吡啶为辅助配体，采用一种新的合成方法，设计并合成了高效的三氮杂环戊二烯基磷光铱配合物。在配体的不同位置引入氟原子和三氟甲基，详细研究了它们对配合物光物理性质的影响。所有的三唑吡啶基配合物显示蓝移双峰发射相比，戊烷-2，4-二酮基的具有宽的单峰发射。配合物在溶液中具有宽的半峰全宽（FWHM），发光范围从绿黄色到橙子，绝对量子效率（phi（PL））为0.21-0.92，即：Phi（PL）= 0.92（18），是中性黄色铱（III）配合物中的最高值。此外，高性能的黄色和互补色基的白色有机发光二极管（OLED）已被制造。黄色、绿黄色OLED的半高宽在94-102 nm的范围内，这是所报道的没有受激准分子发射的黄色或绿黄色发光器件的最高值之一。单色OLED的最大外量子效率可以达到24.1%，这也是已报道的黄色或绿黄色器件中的最高值。蓝色和互补黄色基白色OLED的显色指数高达78。
Highly efficient lepidine-based phosphorescent iridium(III) complexes with pentane-2,4-dione or triazolpyridine as ancillary ligands have been designed and prepared by a newly developed facile synthetic route. Fluorine atoms and trifluoromethyl groups have been introduced into the different positions of ligand, and their influence on the photophysical properties of complexes has been investigated in detail. All the triazolpyridine-based complexes display the blueshifted dual-peak emission compared to the pentane-2,4-dione-based ones with a broad single-peak emission. The complexes show emission with broad full width at half maximum (FWHM) over 100 nm, and the emissions are ranges from greenish-yellow to orange region with the absolute quantum efficiency (phi(PL)) of 0.21-0.92 in solution, i.e., phi(PL) = 0.92 (18), which is the highest value among the reported neutral yellow iridium(III) complexes. Furthermore, high-performance yellow and complementary-color-based white organic light-emitting diodes (OLEDs) have been fabricated. The FWHMs of the yellow, greenish-yellow OLEDs are in the range of 94-102 nm, which are among the highest values of the reported yellow or greenish-yellow-emitting devices without excimer emission. The maximum external quantum efficiency of monochrome OLEDs can reach 24.1%, which is also the highest value among the reported yellow or greenish-yellow devices. The color rendering indexes of blue and complementary yellow-based white OLED is as high as 78.