Doped red organic electroluminescent devices based on a cohost emitter system

Autor:	Tswen-Hsin Liu, Chin H. Chen, Chung-Yeh Iou
Rok vydání:	2003
Předmět:	Materials science Physics and Astronomy (miscellaneous) business.industry Doping chemistry.chemical_element Electroluminescence Fluorescence Organic semiconductor chemistry Aluminium OLED Optoelectronics business Common emitter Diode
Zdroj:	Applied Physics Letters. 83:5241-5243
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.1635986
Popis:	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/cm2 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/m2.
Databáze:	OpenAIRE
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