高效率和色稳定性的双超薄发光层的黄光有机电致发光器件

Highly Efficient and Chromatic-Stability Yellow Organic Light Emitting Diodes Using Double Ultra Thin Yellow Emissive Layers

主要对rubrene黄光发光材料制作0.1nm厚度的超薄发光层的有机电致发光器件作了研究,并配合BCP空穴阻挡层探讨了对器件效率和色坐标稳定性的影响。双超薄rubrene发光层配合BCP空穴阻挡层的有机电致发光器件的性能得到了很好的改善,外加电压6V时,器件电流效率为6.35cd.A-1;外加电压10V时,器件发光亮度达到了7068cd.m-2。另外,在较大的外加电压驱动范围内,器件的色坐标一直保持在(0.49,0.49)。增加的发光效率和良好的色坐标稳定性主要是取决于空穴与电子的注入与输运平衡以及激子在超薄rubrene发光层中稳定性的复合平衡。

The authors investigated the efficiency and chromatic-stability characteristics of organic light emitting devices （OLEDs） with ultra-thin yellow emissive layers of 0.1 nm 5,6,11,12,-tetraphenylnaphthacene （rubrene） and hole block layer of BCP.The OLEDs with double thin rubrene layers and BCP layer were found to exhibit a high luminance and electroluminescence （EL） efficiency.The maximum EL efficiency and luminance reached 6.35 cd·A-1 at 6 V and 7 068 cd·m-2 at 10 V respectively.Moreover,Commission International De L’Eclairage （CIE） coordination maintained unchanged （0.49,0.49） in the wide range of applied voltages.The enhanced efficiency and good chromatic stability were attributed to a balanced injection and transport of electrons and holes and the expected confinement and balanced recombination of the emission region in the ultra-thin rubrene layers.