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A series of Zn–Cu–In–S nanocrystals(ZCIS NCs) are prepared and the optical properties of the ZCIS NCs are tuned by adjusting the reaction time. It is interesting to observe that the temperature-dependent photoluminescence(PL) spectra of the ZCIS NCs show a redshift with decreasing intensity at low temperature(50–280 K) and a blueshift at high temperature(318–403 K). The blueshift can be explained by the thermally active phonon-assisted tunneling from the excited states of the low-energy emission band to the excited states of the high-energy emission band.
A series of Zn-Cu-In-S nanocrystals (ZCIS NCs) were prepared and the optical properties of the ZCIS NCs are tuned by adjusting the reaction time. It is interesting to observe that the temperature-dependent photoluminescence (PL) spectra of the ZCIS NCs show a redshift with decreasing intensity at low temperature (50-280 K) and a blueshift at high temperature (318-403 K). The blueshift can be explained by the thermally active phonon-assisted tunneling from the excited states of the low -energy emission band to the excited states of the high-energy emission band.