基于Zn(Q-Ph)2与DCJTB非掺杂型OLED的制备及其电致发光性能研究

合成了有机发光材料2-苯基-8-羟基喹啉锌Zn(Q-Ph)2, 通过1H NMR, UV-Vis及MS等手段对配合物进行了结构表征. 利用该材料与高效的红光染料DCJTB复合制备出全新结构的非掺杂型OLED器件, 其结构为ITO/NPB/DCJTB/Zn(Q-Ph)2/AlQ3/Al. 将DCJTB超薄层的厚度调节到0—2.0 nm范围内, OLED器件的发光色调经历了黄光、红光和橙光的转变, 并且探讨了DCJTB厚度对OLED发光机理以及发光复合区域的影响. 当DCJTB的厚度为0.5 nm时, 获得了稳定的红光发射, 该器件在5.5 V电压下启亮, 在25 V外加电压下发光亮度达到420 cd/m2, 对应的电流密度为250 mA/cm2.

Preparation and Electroluminescence Property of a Non-doping OLED Based on Zn(Q-Ph)2 and DCJTB

As electroluminescent material zinc bis(2-phenyl-8-hydroxyquinolato)Zn(Q-Ph)2] was synthesized and characterized by 1H NMR, UV-Vis and MS measurements. DCJTB4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran], a highly efficient fluorescent dye, and Zn(Q-Ph)2 were used to fabricate a kind of novel non-doping organic light-emitting diode with a structure of ITO/NPB{N,N'-Di(1-naphthalenyl)-N,N'-diphenyl]-(1,1'-biphenyl)-4,4'-diamine}/DCJTB/Zn(Q-Ph)2/AlQ3(8-hydroxyquinoline aluminum)/Al. By changing the thickness of ultra-thin layer DCJTB, yellow-light, red-light and orange-light emission from OLEDs were studied. Their luminescent color, electroluminescent mechanism and recombination zone were optimized in this paper. When a 0.5 nm-thick DCJTB was used, a stable red emission was obtained. With a lower turn-on voltage at about 5.5 V, the non-doping OLED showed a ma-ximum brightness of 420 cd/m2 and current density of 250 mA/cm2 at 25 V.