Affiliation:
1. Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, China
2. Market Supervision and Management of Jingdezhen City Comprehensive Inspection and Testing Center, Jingdezhen, China
3. Jingdezhen Red Leaf Ceramics Co. Ltd, Jingdezhen, China
Abstract
Novel tungstate SrLa6-xW10O40: xEu3+ (x = 0, 0.03, 0.06, 0.09, 0.12, 0.15,
0.18, 0.21) red phosphors were prepared by solid state method at 1150 ?C by
using SrCO3, La2O3, WO3 and Eu2O3 as raw materials. The powders were
agglomerated with particles having mostly spheroidal morphology, mean
particle size D50 = 12.8 ?m and narrow particle size distribution. With the
increase of doping amount x, there is no significant difference in the
diffraction peak position of the phosphor, but the cell volume of
SrLa6W10O40 slowly decreases. The relative strength of diffraction peaks
decreases gradually and the half-peak width widens gradually, indicating
that the inclusion of Eu3+ ions affects the crystallization of the
SrLa6W10O40 matrix. Excitation and emission spectra of the prepared samples
were obtained. The optimal doping content has the SrLa5.85W10O4: 0.15Eu3+
phosphor and is characterised with the colour coordinate of (0.652, 0.348),
which is closer to the red standard colour (0.67, 0.33) than the
near-ultraviolet red phosphor Y2O2S: Eu3+ (0.622, 0.351) used for commercial
LED.
Publisher
National Library of Serbia