Coumarin concentration effect on PVK-based blue light-emitting diodes

被引:12
作者
Gautier-Thianche, E [1 ]
Sentein, C [1 ]
Nunzi, JM [1 ]
Lorin, A [1 ]
Denis, C [1 ]
Raimond, P [1 ]
机构
[1] Ctr Etud Saclay, Grp Composants Organ, DEIN SPE, CEA Technol Avancees,LETI, F-91191 Gif Sur Yvette, France
关键词
light-emitting diodes; coumarin; poly (9-vinylcarbazole);
D O I
10.1016/S0379-6779(97)04044-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the influence of the doping ratio on current-voltage characteristics and electroluminescence quantum efficiency of single-layer poly(9-vinylcarbazole) (PVK)-polymer blue light-emitting diodes. Driving voltage increases monotonically with coumarin doping ratio, up to 10(-1)% photons/electron for a 30 wt.% doping ratio. Time-of-flight experiments give evidence of a hole-trapping effect of the coumarin. It improves the balance for injection of holes and electrons. Holes which drift through the film are expected to have a higher probability of recombination with electrons on the coumarin luminescent centers. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:323 / 324
页数:2
相关论文
共 4 条
[1]   Blue light-emitting diodes with doped polymers [J].
Gautier, E ;
Nunzi, JM ;
Sentein, C ;
Lorin, A ;
Raimond, P .
SYNTHETIC METALS, 1996, 81 (2-3) :197-200
[2]  
GILL WD, 1976, PHOTOCONDUCTIVITY RE, P63
[3]   ELECTROLUMINESCENCE FROM POLYMER BLENDS AND MOLECULARLY DOPED POLYMERS [J].
VESTWEBER, H ;
SANDER, R ;
GREINER, A ;
HEITZ, W ;
MAHRT, RF ;
BASSLER, H .
SYNTHETIC METALS, 1994, 64 (2-3) :141-145
[4]  
WEISSMANTEL C, 1981, GRUNDLAGEN FESTKORPE, P361