NDLI: Dual active luminescence centers from a single-solid composite SnO2:Eu3+/Al-MCM-41: defect chemistry mediated color tuning for white light emission

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Dual active luminescence centers from a single-solid composite SnO2:Eu3+/Al-MCM-41: defect chemistry mediated color tuning for white light emission

Content Provider	Semantic Scholar
Author	Du, Chunfang Yang, Huaming
Copyright Year	2013
Abstract	In this work, we report on white light generation by defect chemistry modification in a single-solid SnO2:Eu3+/Al-MCM-41 composite. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherms, UV-vis diffuse reflectance spectra and luminescence spectra. It is found that the mesoporous material Al-MCM-41 with a large specific surface area (1040 m2 g−1) and narrow pore size distribution (2.7 nm) was successfully prepared via pretreating kaolin through a simple ball milling approach. SnO2:Eu3+ nanocrystals with fine crystalline nature and ultra-small particle sizes were successfully incorporated into the channels of the host matrix Al-MCM-41 through a hydrothermal route. Contrary to the theoretical predictions of the quantum size effects, SnO2:Eu3+/Al-MCM-41 composites showed an abnormal band gap narrowing with particle size reduction, which can be well-defined as a function of surface defects and Eu3+ doping effects. By varying the Sn/Si molar ratios and Eu3+ doping concentration, the highly defective SnO2:Eu3+/Al-MCM-41 composites exhibited tunable defect chemistry mediated broad band emission and typical Eu3+ red emission that could modulate the color of light and improve the color rendering index (CRI). As a result, a maximum external quantum efficiency of 37.2% and white light with the color coordinates of (0.26, 0.22) in the CIE1931 color space were observed for the SnO2:(6.13%)Eu3+/Al-MCM-41 composite with a Sn/Si molar ratio of 0.183 when it was excited by near-ultraviolet light.
Starting Page	13990
Ending Page	13999
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1039/C3RA41323C
Alternate Webpage(s)	http://www.rsc.org/suppdata/ra/c3/c3ra41323c/c3ra41323c.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C3RA41323C
Volume Number	3
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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