Affiliation: | 1. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd., Beijing, China
GRIREM Advanced Materials Co., Ltd., Beijing, China
General Research Institute for Nonferrous Metals, Beijing, China
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China;2. General Research Institute for Nonferrous Metals, Beijing, China;3. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd., Beijing, China;4. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd., Beijing, China
GRIREM Advanced Materials Co., Ltd., Beijing, China
General Research Institute for Nonferrous Metals, Beijing, China |
Abstract: | The Eu2+-activated nitride phosphors have been widely used in solid-state lighting, but the applications in high-power white-light-emitting diodes (wLEDs) field require higher thermal stability of luminescent materials. The oxidation of Eu2+ and the damage of nitride host in the Eu2+-activated nitride phosphors are the two crucial reasons for the luminescence loss while operating. A superficial organic carbon modification is performed on the red-emitting (Sr,Ca)AlSiN3:Eu2+ phosphor via the incorporation of organic carbon by solution mixing and thermal post-treatment under the N2-H2 atmosphere. After the superficial organic carbon modification, the oxidation of Eu2+ and the formation of impurity phases on the phosphor surface are effectively reduced. When the superficial organic carbon modified sample was treated in the 2 wt.% sucrose solutions, the relative brightness is strengthened by 2.15%, the thermal quenching characteristic is improved by 8.9% at 300℃, and the aging test results show an excellent thermal stability. All above indicate that the superficial organic carbon modification is a promising technique to enhance the thermal stability of analogous Eu2+-activated nirtide phosphors. |