不同发光染料的顶发射有机电致发光器件的研制

通过设计合理的微腔结构,制备了基于绿光染料C545t、黄光染料Rubrene、红光染料DCJTB的3种顶发射有机电致发光器件。研究了不同发光染料对顶发射器件的光谱的影响。研究表明,微腔结构对光谱具有窄化作用。绿光、黄光器件的发光峰波长并未随视角增大而明显变化,体现出良好的光谱角度性,而红光器件却出现了明显的光谱蓝移现象。绿光器件的最大功率效率为8.7 lm/W,当电流密度为45 m A/cm2时,亮度能达到7 205 cd/m2;黄光器件的电流效率最大值为11.5 cd/A,当电流密度为48 m A/cm2时,亮度可达到3 770 cd/m2;红光器件的电流效率最大能达到3.54 cd/A,当电流密度为50 m A/cm2时,可获得1 358 cd/m2的亮度。采用合适的发光材料以及合适的器件结构,不仅可以提高顶发射器件的色纯度及发光效率,还可以改善器件发光光谱的角度依赖性。

Top-emitting Organic Light-emitting Devices with Different Luminescent Dyes

Three kinds of top-OLEDs with fluorescent dyes-green C545t, yellow Rubrene and red DCJTB were fabricated by reasonable design of microcavity structure, and the corresponding optical properties were also studied. The results show that the spectrum of OLEDs can be narrowed by mi-cro-cavity effect. With the increasing of the viewing angle, the spectral peak of green C545t and yellow Rubrene devices don't change significantly and exhibit independence of the viewing angle, however, an obvious blue shift of red DCJTB device can be observed. The maximum power efficien-cy of green device is 8. 7 lm/W, and the brightness is 7 205 cd/m2 with the current density of 45 mA/cm2 . The maximum current efficiency of yellow device is 11. 5 cd/A, and the brightness is 3 770 cd/m2 with the current density of 48 mA/cm2 . The maximum current efficiency of red device is 3. 54 cd/A, and the brightness is 1 358 cd/m2 with the current density of 50 mA/cm2 . Not only the chroma and luminous efficiency but also the angle-independence of the top-OLED can be im-proved by the use of appropriate luminescent material and suitable device structure.