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制备了结构为ITO/TPD/ZN(BTZ)2AL的有机电致发光(EL)器件,经测试发现,ZN(BTZ)2发光层厚度对器件EL光谱有较大影响。当ZN(BTZ)2层厚度分别被控制在50和80 NM时,EL谱中都只有1个峰,其峰值分别为580和470 NM;当ZN(BTZ)2层厚度被控制在50~80 NM时,EL谱同时出现470和580 NM的2个峰,且它们的相对发光强度与ZN(BTZ)2层厚度也有关系,随着ZN(BTZ)2层厚度越接近80 NM(或50 NM)时,EL谱峰值为470 NM的光就相对越强(或弱),峰值为580 NM的光就相对越弱(或强)。通过调整ZN(BTZ)2层厚度,在65 NM左右时得到色度较好的白光器件,其色坐标为(0.33,0.33)。为了研究器件的光致发光(PL)谱,制备结构为TPD/ZN(BTZ)2的有机薄膜,经测试发现,薄膜PL谱与ZN(BTZ)2层厚度无关,其光谱峰值在480 NM处,与相关文献报道一致。对上述现象进行了分析。
The organic electroluminescence (EL) device with ITO / TPD / ZN (BTZ) 2AL structure was prepared. It was found that the thickness of the luminescent layer of ZN (BTZ) 2 greatly affected the EL spectrum of the device. When the thickness of the ZN (BTZ) 2 layer was controlled at 50 and 80 NM respectively, there was only one peak in the EL spectrum, with peak values of 580 and 470 NM respectively. When the thickness of the ZN (BTZ) 2 layer was controlled at 50-80 NM, there are two peaks of 470 and 580 NM in the EL spectra, and their relative luminescence intensity is also related to the thickness of the ZN (BTZ) 2 layer. As the thickness of the ZN (BTZ) 2 layer approaches 80 NM (or 50 NM ), The light with the EL peak at 470 nm is relatively stronger (or weaker) and the light with the peak at 580 NM is relatively weaker (or stronger). By adjusting the thickness of ZN (BTZ) layer 2, a white device with better chroma is obtained at about 65 NM with a color coordinate of (0.33, 0.33). In order to study the photoluminescence (PL) spectrum of the device, an organic thin film with the structure TPD / ZN (BTZ) 2 was prepared. It was found that the PL spectrum of the thin film was irrelevant to the thickness of the ZN (BTZ) , Consistent with the relevant literature. The above phenomenon was analyzed.