Title :
Energy-band schemes of highly stable organic electroluminescent devices
Author :
Sano, Takeshi ; Hamada, Yuji ; Shibata, Kenichi
Author_Institution :
New Mater. Res. Center, Sanyo Electr. Co. Ltd., Osaka, Japan
Abstract :
Host-guest systems in organic electroluminescent (EL) devices have been studied. Organic EL cells doped with blue to red guest emitters were prepared and their characteristics and the energy bands of the materials were measured. A green EL cell doped with 2,3-quinacridone showed a maximum efficiency of 18.1 lm/W. A yellow EL cell doped with 5,6,11,12-tetraphenylnaphthacene (rubrene) showed a maximum efficiency of 14.4 lm/W and a half-decay time of 25000 h from 130 cd/m2. The energy-band schemes of those cells were analyzed and requirements for the scheme and a guest emitter are discussed.
Keywords :
band structure; electroluminescent devices; fluorescence; life testing; optical materials; optical testing; organic compounds; stability; 2,3-quinacridone; 25000 h; 5,6,11,12-tetraphenylnaphthacene; blue guest emitters; energy bands; energy-band schemes; green EL cell; half-decay time; highly stable organic electroluminescent devices; host-guest systems; maximum efficiency; organic dye doped electroluminescent devices; red guest emitters; rubrene; yellow EL cell; Cathodes; Electroluminescent devices; Energy measurement; Extraterrestrial measurements; Fluorescence; Glass; Ionization; Optical films; Organic materials; Spectroscopy;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.669462
