超薄发光层的高效蓝色荧光有机电致发光器件

Ultra-thin light emitting layer of efficient blue fluorescent organic electroluminescent devices

分别采用MoO_3为空穴注入材料,NPB为空穴传输材料,TPBI为空穴阻挡材料,制备了结构为ITO/MoO_3/TCTA/DOPPP/TPBI/Li F/Al的蓝色有机电致发光器件.讨论了改变发光层厚度和空穴传输层对器件发光特性的影响.当在MoO_3和TCTA间插入NPB,同时发光层厚度为1nm时器件的性能最好.在电压为14.5 V,电流密度为330m A/cm2时,亮度达到最大为10110cd/m2,CIE色坐标为(0.154,0.151).在电压为13.5V,电流密度为168m A/cm2时,器件的最大电流效率为3.55cd/A,CIE色坐标为(0.152,0.144).

Usin MoO_3 as hole injection material,NPB as hole transport material,TPBI as hole blocking material,respectively. The device structure is ITO / MoO_3/ TCTA / DOPPP / TPBI / Li F / Al. We study the effect that changing the thickness of the emitting layer and the hole transport layer. We achieve a better performance of the device which the thickness of the emissive layer is 1nm when inserting NPB between MoO_3 and TCTA. A maximum luminance of 10110 cd / cm2 and 330m A / cm2at14. 5V with a saturated blue CIE color coordinate of( 0. 154,0. 151) and a maximum current efficiency of 3. 55 cd /A and 168 m A/cm2 at 13. 5V with a saturated blue CIE color coordinate of( 0. 152,0. 144) have been achieved.