期刊
JOURNAL OF LUMINESCENCE
卷 178, 期 -, 页码 301-306出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2016.06.013
关键词
ZnO; Photoluminescence; Li acceptor; Thermal quenching
类别
资金
- National Science Foundation [DMR-1410125]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410125] Funding Source: National Science Foundation
The abrupt and tunable quenching of photoluminescence (PL) in bulk ZnO samples is reported, a phenomenon which has been previously observed only in GaN and a few phosphorescent materials. ZnO samples grown by the hydrothermal method contain Li defects responsible for the orange luminescence (OL) band with a maximum at 2.0 eV. The Li-zn, acceptor is well studied, but there is some disagreement in the literature on the value of its ionization energy. Here we show that the ionization energy of the Li-zn, acceptor responsible for the OL band is 0.65 +/- 0.10 eV. The thermal emission of holes from the Li-zn, acceptor to the valence band and their subsequent capture by unknown nonradiative centers causes the abrupt quenching of PL, the temperature of which is tunable by excitation intensity. Published by Elsevier B.V.
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