噻吩基联苯乙烯蓝色发光材料的合成与发光性能

Synthesis and Luminescence of a Blue-light-emitting Material of Thiophenyl Distyrylarylene

设计并合成了新型含噻吩基团的联苯乙烯类蓝色有机电致发光材料4,4′-双(2-苯基-2-(2-噻吩)乙烯基)-1,1′-联苯(TPVBi),通过红外、核磁共振、元素分析对其结构进行了表征。利用紫外可见吸收光谱、荧光光谱和循环伏安法等研究了其HOMO、LUMO能级及发光性能。TPVBi溶液的荧光发射峰值波长为451nm,薄膜的荧光光谱最大发射波长为464nm。循环伏安测得其氧化峰电位为1.227V。TPVBi的HOMO能级为-5.55eV,LUMO能级为-2.67eV。以TPVBi作为发光层制作了结构为ITO/CuPc(10nm)/NPB(30nm)/TPVBi(35nm)/TPBi(35nm)/Al(100nm)的有机发光二极管器件,并研究了该器件的电致发光性能。该器件在电压为19.5V时,达到最大亮度1782.3cd/m2,在电流密度为15.69mA/cm2时,最大电流效率为1.73cd/A;器件的发光CIE色坐标为x=0.25,y=0.40。

A novel blue-light-emitting material of thiophenyl distyrylarylene , 4,4＇-bis（2-phenyl-2-（ thiophen- 2-yl） vinyl-l, 1＇-biphenyl was designed and synthesized. Its structure was determined by IR, ^1H NMR and elementary analysis. It＇s HOMO, LUMO and luminescence characteristic was studied by UV-Vis absorption spectra, fluorescence spectra and cyclic vohammetry. The HOMO energy and LUMO energy of TPVBi is - 5.55 eV and - 2.67 eV, respectively. TPVBi emits blue fluorescence with a peak wavelength at 451 nm in solution and with a peak wavelength at 464 nm in film. Organic light-emitting-diode with a structure of ITO/ CuPc （ 10 nm）/NPB （ 30 nm）/TPVBi （ 35 nm）/TPBi （ 35 nm ）/Al （ 100 nm ） was prepared and electroluminescence properties were studied. The device exhibited a maximum luminance of up to 1 782.3 cd/m^2 at 19.5 V and a maximum efficiency of up to 1.73 ed/A at a current density of 15.69 mA/cm^2. The CIE chromaticity coordinates of the light emitted from the device are x = 0.25, y = 0.40.