Highly efficient blue organic light-emitting diodes using various hole and electron confinement layers

  • Kang J
  • Yoon J
  • Yoo S
  • et al.
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Abstract

© 2015 Chinese Optics Letters. In this Letter, blue phosphorescence organic light-emitting diodes (PHOLEDs) employ structures for electron and/or hole confinement; 1,3,5-tris(N-phenylbenzimiazole-2-yl)benzene is used as a hole confinement layer and tris-(phenylpyrazole)iridium [Ir(ppz) 3 ] is utilized for an electron confinement layer (ECL). The electrical and optical properties of the fabricated blue PHOLEDs with various carrier-confinement structures are analyzed. Structures with a large energy offset between the carrier confinement and emitting layers enhance the charge-carrier balance in the emitting region, resulting from the effective carrier confinement. The maximum external quantum efficiency of the blue PHOLEDs with the double-ECLs is 24.02% at 1500 cd/m 2 and its luminous efficiency is 43.76 cd/A, which is 70.47% improved compared to the device without a carrier-confinement layer.

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APA

Kang, J. S., Yoon, J.-A., Yoo, S. I., Kim, J. W., Lee, B. M., Yu, H. H., … Kim, W. Y. (2015). Highly efficient blue organic light-emitting diodes using various hole and electron confinement layers. Chinese Optics Letters, 13(3), 032301. https://doi.org/10.3788/col201513.032301

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