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我们研制了用有机材料Tb(AcA)_3·phen作为发射层的绿色发光二极管,两层结构为玻璃衬底ITO/芳香族二胺类衍生物TPD/Tb(AcA)_3·phen/A1。各功能层均用真空热蒸发的方法制备。在正向直流偏压驱动下获得了Tb~(3+)的特征发光,同时还发现一个峰位425um的蓝光发射,它来源于空穴输运层TPD。在室温条件下器件的阈值电压为4V,当驱动电压提高到16V时,器件的最高发光亮度达到200cd/m~2,同时在相同条件下制备了结构为玻璃衬底ITO/芳香族二胺类衍生物TPB/Tb(AcA)_3·phen/A1的器件,通过对两种器件光谱及电学特性的测量、比较与分析,探讨了有关稀土有机电致发光的发光机理等问题。
We have developed a green LED with an organic material of Tb (AcA) 3 · phen as the emissive layer and a two-layer structure of a glass substrate ITO / aromatic diamine derivative TPD / Tb (AcA) 3 · phen / A1. Each functional layer is prepared by vacuum thermal evaporation. Tb ~ (3+) emission was obtained under the forward DC voltage bias. At the same time, a 425nm blue emission was also found, which is derived from the hole transport layer TPD. The threshold voltage of the device is 4V at room temperature. When the driving voltage is increased to 16V, the maximum brightness of the device reaches 200cd / m ~ 2. Under the same conditions, a glass substrate ITO / aromatic diamine Derivative TPB / Tb (AcA) _3 · phen / A1 devices, the two devices by measuring the spectral and electrical characteristics of the comparison and analysis of the rare earth organic electroluminescence mechanism of light and other issues discussed.