高稳定性的红色有机薄膜电致发光器件

有机薄膜电致发光作为新型的平板显示器件受到人们广泛的关注。有机发光器件研究的一个目标是发展全色显示。目前绿色和蓝色器件都实现了高亮度和长寿命。有关红色有机发光器件也有一些报道。如 Ｃ．Ｗ．Ｔａｎｇ等报道的 ＤＣＭ红光器件［１］，Ｊ．Ｋｉｄｏ［２］利用稀土有机物作为红色发射体，Ｐ．Ｅ．Ｂｕｒｒｏｕｓ报道的ＴＰＰ掺杂［３］Ｙ．Ｈａｍａｄａ报道的ＺｎＴＰＰ掺杂［４］， Ｍ． Ａ． Ｂａｌｄｏ利用ＰｔＯＥｐ［５］都得到红光。最近 Ｙ． Ｈａｍａｄａ报道利用ｒｕｂｒｅｎｅ作为辅助掺杂得到的红光器件色度不随电压的…

High Stable Red Organic Emitting Diode

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. )