级联分层优化的薄膜电致发光

ENHANCEMENT OF GREEN EMISSION FROM A TFEL DEVICE BY MEANS OF SERIAL LAYERED OPTIMIZATION

根据发光层中电子能量分布的不均匀性,在分层优化薄膜电致发光器件的发光层中插入SiO_2层,即级联分层优化薄膜电致发光器件。结果表明:由于SiO_2的加速作用,这种方法确实可以提高过热电子的能量。但发光强度及发光效率的提高还受发光层的结晶状态的影响。插入一层SiO_2后,样品的绿光强度提高了60％,发光效率也有所增加。插入两层SiO_2后,由于发光层结晶状态变差,绿光强度及发光效率都降低了。

The hot electron energy was obviously increased by inserting SiO2 layers into the central part of the luminescent layer in the layered optimized TFEL devices. But the improvement of brightness and efficiency was dependent on the crystallinity of the active layer. The green emission intensity and efficiency of the sample with two active layers were higher than that of the one-active-layer sample, while they were decreased greatly in the 3-active -layer sample due to the poor quality of the active layer.