NaEu0.96Sm0.04(MoO4)2 as a promising red-emitting phosphor for LED solid-state lighting prepared by the Pechini process |
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Authors: | Zhengliang Wang Liya Zhou Jing Wang Qiang Su |
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Affiliation: | a State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China b School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China |
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Abstract: | NaEu0.96Sm0.04(MoO4)2 was prepared by the Pechini method (P phosphor) and as a comparison, also by solid-state reaction technique (S phosphor). The photo-luminescent properties, the morphology and the grain size were investigated. The phosphors show broadened excitation band around 400 nm, high intensity of Eu3+5D0→7F2 emission upon excitation around 400 nm, and appropriate CIE chromaticity coordinates. Intensive red light-emitting diodes (LEDs) were fabricated by combining the phosphor and a 400 nm InGaN chip for the first time, which confirm that the phosphor is a good candidate for near UV LED. The luminescent intensity of P phosphor prepared at 700 °C is near that of S phosphor prepared at 800 °C. In addition, P phosphor shows advantages of lower calcining temperature, shorter heating time, and smaller grain size. Considering all these factors, the suitable method for preparing the promising near UV LED phosphor NaEu0.96Sm0.04(MoO4)2 is recommended to be the Pechini process at 700 °C. |
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Keywords: | Pechini method Phosphor Photoluminescence Light-emitting diodes |
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