期刊
APPLIED PHYSICS LETTERS
卷 100, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4717714
关键词
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资金
- NSFC [51172041, 60907016]
- Program for New Century Excellent Talents in University [NCET-11-0615]
- 973 Program [2012CB933703]
- Fund from Jilin Province [20121802, 201201061, 20100339, FH0009]
- Fundamental Research Funds for the Central Universities [11CXPY004, 11QNJJ011, 11SSXT128, 10SSXT152]
- Ministry of Education of China [20110043120004]
Ultraviolet light-emitting diodes using MgZnO-coated and bare ZnO nanorod arrays as active layers were manufactured. Both types were exposed to ambient air over a 1-yr period to assess their stability. By monitoring the electroluminescence evolution with air-exposure time and comparing the changes of electroluminescence and x-ray photoelectron spectra before and after vacuum desorption, it is concluded that surface-adsorbed O-2 and OH- species, as acceptor and donor surface states, quench ultraviolet electroluminescence, and favor undesirable surface-mediated nonradiative and deep-level recombination. The MgZnO coating prevents surface adsorption, and so the coated nanorod device shows higher efficiency and stability than the uncoated one. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4717714]
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