Acta Photonica Sinica, Volume. 45, Issue 1, 116001(2016)
Effects of Composition on Photoluminescence Properties of Cu-Zn-In-S/ZnS Core/shell Quantum Dots
Cu-Zn-In-S/ZnS core/shell quantum dots (QDs) with various Cu/Zn molar ratios were synthesized by a hot-injection method. The effects of Cu/Zn ratios on the photoluminescence (PL) properties of Cu-Zn-In-S/ZnS core/shell QDs were investigated by UV-vis absorption, steady-state, and time-resolved PL spectroscopy. It could be observed that the Cu-Zn-In-S/ZnS QDs with various Cu/Zn ratios exhibited zinc blende structure and similar grain sizes. The blue shift in absorption onset of Cu-Zn-In-S/ZnS core/shell QDs increased with reducing Cu/Zn ratios, resulting from widened bandgap of the QDs due to the difference in QD composition. The corresponding emission wavelength of QDs was also blue-shifted from 640 nm to 529 nm when Cu/Zn ratios decreased from 6/1 to 1/6. The Cu-Zn-In-S/ZnS core/shell QDs exhibited an enhanced PL quantum yield with decreasing Cu/Zn ratios because Zn2+ substituting Cu+ could inhibit the defect formation of Cu interstitial atoms. In addition, Cu+ ions emission is observed in the sample with Cu/Zn=1/6, companying with longer PL lifetime.
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HUA Jie, LIU Yang, SHAN Mei-ling, ZHAO Jia-long, LI Hai-bo. Effects of Composition on Photoluminescence Properties of Cu-Zn-In-S/ZnS Core/shell Quantum Dots[J]. Acta Photonica Sinica, 2016, 45(1): 116001
Received: Aug. 27, 2015
Accepted: --
Published Online: Mar. 22, 2016
The Author Email: Jie HUA (huajie@jlnu.edu.cn)