Doped red organic electroluminescent devices based on a cohost emitter system

Tswen-Hsin Liu, Stuart S.P.; Chung-Yeh Iou, Stuart S.P.; Chen, Chin H.
December 2003
Applied Physics Letters;12/22/2003, Vol. 83 Issue 25, p5241
Academic Journal
We have developed an efficient red emitter in organic light-emitting diodes based on the fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)-4H-pyran doped in a cohost emitter system of 5,6,11,12-tetraphenylnathacene/tris(8-hydroxyquinolinato)aluminum which achieved an electroluminescence (EL) efficiency of 4.4 cd/A and 2.1 lm/W at 20 mA/cm[sup 2] and 6.8 V, with a near saturated Commission Internationale d’Eclairage coordinates (x=0.65, y=0.35). This cohost emitter system has the advantage of alleviating the current-induced fluorescence quenching often encountered in red organic EL devices and greatly improves the EL efficiency over a wide range of drive current conditions. From accelerated degradation tests, a device half-life of about 33 800 h can be projected in this system at an initial device luminance of 100 cd/m[sup 2]. © 2003 American Institute of Physics.


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