Nature of the green luminescent center in zinc oxide

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:441097

Vanheusden, K; Warren, W L; Seager, C H; Tallant, D R ^[1]; Caruso, J; Hampden-Smith, M J; Kodas, T T ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Nanochem Research Inc., Albuquerque, NM (United States)

EPR, optical absorption, and photoluminescence spectroscopies are used to characterize a wide range of different ZnO phosphor powders. A good correlation is generally observed between the 510-nm green emission intensity and the density of paramagnetic isolated oxygen vacancies. Both quantities are found to peak at a free-carrier density of about 1.4x10{sup 18}cm{sup -3}. The green emission intensity can be strongly influenced by free-carrier depletion at the particle surface, especially for small particles and/or low doping. The data suggest that the green PL in ZnO phosphors is due to recombination of electrons in singly occupied oxygen vacancies with photoexcited holes in the valence band.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 441097
• Report Number(s): SAND--97-0177C; CONF-961202--39; ON: DE97002530
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
CRYSTAL DEFECTS
INORGANIC PHOSPHORS
PHOTOLUMINESCENCE
POWDERS
ZINC OXIDES