稳定的蓝色及白色有机薄膜电致发光器件

报道了一种稳定的蓝色和白色有机薄膜电致发光器件，蓝色器件最大亮度为7526cd／m^2，最大效率1．451m／W，半亮度寿命1035h(初始亮度l00cd／m^2)。白色器件的最大亮度为14850cd／m^2，最大效率2．881m／W，色度x=0．31，y=0．38，且色度不随电流增大而变化，半亮度寿命为2860h(初始亮度100cd／m^2)。

Stable Blue and White Organic Light Emitting Diodes

A blue organic light emitting diode (OLED) with rather stability was realized by using a new blue emitting material. In this device, copper phthalocyanine (CuPc) was chosen as a buffer layer, N,N' bis (1 naphthy1) N,N' diphenyl 1,1' biphenyl 4 4' diamine (NPB) was used as the hole transporting layer, 9,10 bis(3'5' diaryl)phenyl anthracene (JBEM) was used as the emitting layer, in which peryrene was doped, then Alq was used as the electron transporting, MgAg alloy as the cathode. The structure of blue device was ITO/CuPc/NPB/JBEM:Peryrene/Alq/MgAg. Based on the blue device, a white device was constructed in which both perylene and DCJTB were doped in the emitting layer JBEM, the structure was ITO/CuPc/NPB/JBEM:Peryrene: DCJTB/Alq/MgAg. The luminance, chromaticity and EL spectra of the OLED cells were measured with PR 650 Spectrascan Spectra Colorimeter. The characteristic of current voltage was measured by using a Keithley 2400 Source Meter. Operation of the encapsulated EL cell was conducted at room temperature using a DC voltage current source in the constant current mode. For the blue device, maximum luminance of 7 526cd/m 2 , the luminance of 408cd/m 2 under current density of 20mA/cm 2, maximum efficiency 1 45 lm/W, the half decay time of 1035h at initial luminance of 100cd/m 2 were achieved. The white OLED shows the CIE coordinates x =0 32, y =0 38 and the independence of CIE coordinates on the current density. The maximum luminance of 14 852cd/m 2 ,the luminance of 878cd/m 2 under current density of 20mA/cm 2, maximum efficiency of 2 88 lm/W and half decay time of 2 860h at initial luminance of 100cd/m 2 were obtained.