NaEu0.96SM0.04(MoO4)(2) as a promising red-emitting phosphor for LED solid-state lighting prepared by the Pechini process

摘要

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+ D-5(0) -> F-7(2) emission upon excitation around 400 mu, 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 degrees C is near that of S phosphor prepared at 800 degrees 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 degrees C. (C) 2007 Elsevier B.V. All rights reserved.