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Title: Effects of carbon on optical properties of ZnO powder
Authors: Nguyễn, Tư
Nguyễn, Trí Tuấn
Nguyễn, Thị Khôi
Đỗ, Vân Nam
Đỗ, Quang Trung
Phạm, Thành Huy
Keywords: Pure UV emitter
ZnO crystals
Carbon doping
High-energy ball milling
Photoluminescence quenching
Issue Date: 2016
Series/Report no.: Journal of Luminescence;174 .- p.6-10
Abstract: We report on C-doped ZnO, with different weight percentages of dopant, prepared by a high-energy ball milling method. The annealing conditions with temperature of 800 °C and in argon environment appear to be the optimal conditions for producing good quality crystals as well as pure UV emission. XRD and FTIR analysis indicate the substitution of C for Zn. In addition, Raman spectroscopy suggests a disordered graphitic layer covering the crystals. Photoluminescence investigation reveals the continuous quenching of visible region upon increasing C concentration and the intensity ratio between defect-related and UV emission can be as negligible as 0.02. The passivation of surface defects and the creation of a nonradiative recombination pathway by carbon integration are proposed as possible origins of the sup-pression.
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