Degradation of Organic Electroluminescent Devices. Evidence for the Occurrence of Spherulitic Crystallization in the Hole Transport Layer

Langmuir ◽  
1998 ◽  
Vol 14 (20) ◽  
pp. 5946-5950 ◽  
Author(s):  
P. F. Smith ◽  
P. Gerroir ◽  
S. Xie ◽  
A. M. Hor ◽  
Z. Popovic ◽  
...  
Keyword(s):  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Devices ◽  
Organic Electroluminescent

Molecularly Doped Polymers as a Hole Transport Layer in Organic Electroluminescent Devices

1992 ◽  
Vol 31 (Part 2, No. 7B) ◽  
pp. L960-L962 ◽  
Author(s):  
Junji Kido ◽  
Kenichi Hongawa ◽  
Masafumi Kohda ◽  
Katsutoshi Nagai ◽  
Katsuro Okuyama
Keyword(s):  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Devices ◽  
Organic Electroluminescent ◽  
Doped Polymers

Loss Process in Efficiency of Blue Organic Electroluminescent Devices

2003 ◽  
Vol 771 ◽  
Author(s):  
Yasuo Enatsu ◽  
Chimed Ganzorig ◽  
Masamichi Fujihira
Keyword(s):  
Indium Tin Oxide ◽  
Copper Phthalocyanine ◽  
Radical Cations ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Devices ◽  
Chemically Modified ◽  
Excess Electrons ◽  
Organic Electroluminescent

AbstractWe report EL characteristics of blue organic electroluminescent (EL) devices with a hole transport layer (HTL) as an emitter i.e. ITO/NPD/BCP/Alq3/Cs(0.5 nm)/Al. Here, ITO, NPD, BCP, and Alq3 are abbreviations for indium-tin-oxide, 4,4'-bis[N-(1-naphthyl)-N-phenylamino]- biphenyl, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, and tris(8-hydroxyquinoline) aluminum, respectively. Three different chemically modified ITO electrodes were used. As a hole-injecting buffer layer, copper phthalocyanine (CuPc) or 4,4',4''-tris-(3-methylphenylphenylamino) triphenylamine (MTDATA) was used in this study. We found that the luminance increased less than linearly with an increase in current for all EL devices studied even when hole and electron injection were enhanced. The luminance loss in the device is attributed to quenching singlet excited states (1NPD*) by large excess radical cations (NPD+.) accumulated in the emission zone due to large overlap between a fluorescence spectrum of 1NPD* and an absorption spectrum of NPD+.. In addition, 1NPD* can be also quenched by radical anions (NPD-.) when excess electrons are injected.

An organic electroluminescent device with a molecularly doped polymer hole transport layer

1997 ◽  
Vol 8 (7) ◽  
pp. 437-442 ◽  
Author(s):  
Takashi Uemura ◽  
Nobuyuki Okuda ◽  
Hiroya Kirmura ◽  
Yasuko Okuda ◽  
Yoshinobu Ueba ◽  
...  
Keyword(s):  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Device ◽  
Organic Electroluminescent ◽  
Doped Polymer

Poly(methylphenylsilane) film as a hole transport layer in electroluminescent devices

1991 ◽  
Vol 59 (21) ◽  
pp. 2760-2762 ◽  
Author(s):  
Junji Kido ◽  
Katsutoshi Nagai ◽  
Yoshiyuki Okamoto ◽  
Terje Skotheim
Keyword(s):  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Devices
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