Organic/inorganic F8T2/GaN light emitting heterojunction

Y. J. Wu, C. H. Liao, P. M. Lee, Y. S. Liu, C. L. Liu, C. Y. Liu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


An organic/inorganic white-light emitting F8T2 (9,9-dioctylfluorene-co-bithiophene)/GaN heterojunction is reported. The white-light emission is produced by hybridizing the blue light (464 nm) emitted from the GaN MQWs and the yellow/green light (500–650 nm) emitted at the F8T2/p-GaN interface by electroluminescence (EL). The yellow/green light emission in the F8T2 layer is resulted from the carrier accumulation and Frenkel excitons at the F8T2/p-GaN junction interface. It is concluded that the energy barrier and large mobility discrepancy at the F8T2/p-GaN junction interface cause carriers accumulating in the F8T2 side near the F8T2/p-GaN interface. The accumulated carriers at the F8T2/p-GaN interface form Frenkel excitons by Coulombic interaction. Then, the Frenkel excitons recombine to radiate the yellow/green emission in the F8T2 layer. The International Commission on Illumination (CIE) coordinate of the white-light emitted from the present device is at (0.28, 0.30), which is very close to the standard white light (0.33, 0.33).

Original languageEnglish
Pages (from-to)64-68
Number of pages5
JournalOrganic Electronics
StatePublished - Oct 2017


  • Electroluminescence
  • Exciton
  • GaN
  • Heterojunction
  • LED
  • Organic


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