A stable red organic light-emitting device has been realized by doping a red dye tetra-methyljuloidine (DCJT)in electron transporting layer(ETL). The structure of the device was ITO/ CuPc/ NPB/ Alq: DCJT/ MgAg, where copper phthalocyanine(CuPc) was used as a buffer layer, N, N ’-his-(1-napthyl)-N, N’- diphenyl-1, 1’ -biphenyl-4, 4’ -diamine(NPB) as the hole transporting layer, tris(8-quinolinolato) aluminum complex(Alq) as ETL, in which DCJT was doped, indium tin oxide(ITO) and MgAg were as the anode and cathode, respectively. The red emission with peak at 620nm and CIE coordinates x = 0. 63, y = 0. 37, maximum luminance 4 687cd/m2, maximum luminous efficency 0. 83lm/W were obtained. The device showed a high stability under 12mA/cm2 current density continuous operation, the half decay time reached 2 500 hours at the initial luminance 150cd/m2 and the change of driving voltage was 0. 6mV/hour in the degradation process. If 50cd/m2 is taken as the initial luminance of red device, the half decay time is considered to be 7 500 hours. (According to European Broadcasting Union(EBU) standard, for color display the ratios for red, green, blue luminance should be 30 %, 59 % and 11 %, respectively, since 100cd/m2 is often used as initial luminance of green emission in degradation test, 50cd/m2 should be adapted as the initial luminance for red emission. )
