Optical absorption and photoluminescence studies of n-type GaN

Guang Yuan Zhao, Hiroyasu Ishikawa, Hao Jiang, Takashi Egawa, Takashi Jimbo, Masayoshi Umeno

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


The Si-doping dependence of absorption coefficient and photoluminescence (PL) spectra of GaN grown by metalorganic chemical vapor deposition (MOCVD) was studied at room temperature. Band gap narrowing and band tailing effect were observed in the absorption spectra of GaN samples with high carrier concentration. A clear red shift and broadening of the PL emission peak were observed with increasing dopant concentration, which could also be attributed to the band tailing effect. This study shows that the band tailing effect plays an important role in determining the optical properties of Si-doped GaN.

Original languageEnglish
Pages (from-to)L993-L995
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number9 A/B
Publication statusPublished - 1999 Sept 15
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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