Single-layer white light-emitting organic electroluminescent devices based on dye-dispersed poly(N-vinylcarbazole)

✍ Scribed by Kido, J.; Shionoya, H.; Nagai, K.

• Book ID: 120388944
• Publisher: American Institute of Physics
• Year: 1995
• Tongue: English
• Weight: 373 KB
• Volume: 67
• Category: Article
• ISSN: 0003-6951
• DOI: 10.1063/1.115126

✦ Synopsis

Bright single-layer white light-emitting organic electroluminescent devices were developed by using dye-dispersed poly(N-vinylcarbazole) (PVK). The active layer consists only of one polymer layer that is simply sandwiched between two electrodes, indium-tin oxide, and Mg:Ag. In order to achieve bipolarity in the single polymer emitter layer, PVK was molecularly dispersed with electron-transporting additives such as 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole. In addition, several fluorescent dyes, having different emission colors, were dispersed as emitting centers. By adjusting the concentration of the fluorescent dyes, white light with a maximum luminescence of 4100 cd/m2 was obtained, which is the brightest white light ever observed for organic electroluminescent devices.