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Efficiency improvement of flexible fluorescent and phosphorescent organic light emitting diodes by inserting a spin-coating buffer layer
- Source :
- Thin Solid Films. 517:5338-5342
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- We dissolved hole transport materials α-NPD and NPB in THF solvent, and spin-coated the α-NPD + THF or NPB + THF solution onto ITO anode surface to improve the luminance efficiency and lifetime of flexible fluorescent and phosphorescent organic light emitting diodes. Then the BCP and TPBi were employed as hole blocking layer (HBL) of phosphorescent device and its thickness was optimized. From the experimental results, the maximum luminance efficiency is 4.4 cd/A at 9 V of fluorescent device and 24.4 cd/A of phosphorescent device, respectively. Such an improvement in the device performance was attributed to the smoother surface and good contact between the interface of spin-coated HTL/ITO, the hole were effectively injected from the anode into the organic layer. And the deposited HTL can block excitons from diffusing into the anode to quench, thus improving the luminance efficiency and lifetime greatly.
- Subjects :
- Spin coating
Materials science
business.industry
Exciton
Metals and Alloys
Surfaces and Interfaces
Luminance
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Anode
law.invention
law
Materials Chemistry
OLED
Optoelectronics
business
Phosphorescence
Layer (electronics)
Light-emitting diode
Subjects
Details
- ISSN :
- 00406090
- Volume :
- 517
- Database :
- OpenAIRE
- Journal :
- Thin Solid Films
- Accession number :
- edsair.doi...........97a49e009900ced67e6032ad219efba5