Highly Efficient Green Organic Light-Emitting Diodes Containing Luminescent Three-Coordinate Copper(I) Complexes

A series of highly emissive three-coordinate copper(I) complexes, (dtpb)CuIX [X = Cl (1), Br (2), I (3); dtpb =1,2-bis(o-ditolylphosphino)benzene], were synthesized and investigated in prototype organic light-emitting diodes (OLEDs). 1–3 showed excellent photoluminescent performance in both degassed dichloromethane solutions [quantum yield (Φ) = 0.43–0.60; lifetime (τ) = 4.9–6.5 μs] and amorphous films (Φ = 0.57–0.71; τ = 3.2–6.1 μs). Conventional OLEDs containing 2 in the emitting layer exhibited bright green luminescence with a current efficiency of 65.3 cd/A and a maximum external quantum efficiency of 21.3%.本研究合成了一系列高发光三配位铜(I)配合物(dtpb)CuIX [X=Cl(1)、Br(2)、I(3)；dtpb=1,2-双(邻甲苯基膦)苯]，并将其应用于原型有机发光二极管（Organic Light-Emitting Diode，OLED）中开展性能研究。配合物1~3在脱气二氯甲烷溶液（量子产率Φ=0.43~0.60；发光寿命τ=4.9~6.5 μs）与非晶薄膜（Φ=0.57~0.71；τ=3.2~6.1 μs）中均展现出优异的光致发光性能。以配合物2作为发光层的传统有机发光二极管，呈现出明亮的绿色发光，其电流效率达65.3 cd/A，最大外量子效率为21.3%。