以蓝色发光材料DPVBi为基质的白色发光器件

白色有机发光器件是实现彩色平板显示的重要方案之一。利用蓝色发光材料DPVBi4，4′—(2，2—苯乙烯基)—1，1′—联苯]掺杂红光染料DCJTB4—氰甲烯基—2—叔丁基—6—(1，1，7，7—四甲基久洛尼定基—9—烯炔基—4H—吡喃)]作发光层制备了白色发光器件。研究了DPVBi掺杂不同浓度IDCJTB薄膜的光致发光性质，根据光致发光结果，制备了以DPVBi掺杂不同浓度DCJTB作发光层的电致发光器件，其结构为ITO／GuPc／NPB／DPVBi：DCJTB／Alq3／LiF／Al。当DCJTB质量分数为0．0008时，器件实现了白色发光(色度x=0．25，y=0．32)，电致发光和光致发光的掺杂比例基本相符，表明器件的白色发光主要是由基质DPVBi向掺杂剂DCJTB的能量传递产生的。研究还发现：白色器件随电压升高，光谱中蓝色成分相对于红色成分的比例略有增加，文章对此现象进行了分析。该白光器件在14V时达到最高亮度7822cd／cm^2，在20mA／cm^2电流密度下的亮度为-489cd／cm^2，最大流明效率为1．75lm／W。

A White Organic Light Emitting Diode Based on Blue Emitting Material DPVBi

White organic electroluminescence is one approach to achieve full-color flat panel display. A white organic light emitting diode(OLED) with the emitting layer consisting of blue emitting material DPVBi doped with red dye DCJTB is reported. According to the photoluminescence of DPVBi doped by DCJTB with different mass fractions,the OLEDs are demonstrated with the structure of ITO/CuPc/NPB/DPVBi∶DCJTB%/Alq_3/LiF/Al. White light emission can be produced when the mass fractions of DCJTB is 0.0008%. Although the white emission can be produced when the mass fractions of DCJTB is 0.0008%. Although the shite device shows a little increase in relative intensity of blue emission with increasing applied voltage, the consistent results of photoluminescence and electroluminescence indicate that the white light emission mainly originates from energy transfer from DPVBi to DCJTB. For the white light device with CIE coordinates x=0.25, y=0.32, the maximum luminance, the luminance under current density of 20 mA/cm2 and the maximum luminous efficiency are 7822 cd/m2, 489 cd/m2 and 1.75 lm/W, respectively.