Enhanced luminescence and thermal stability of (Sr, Ca)AlSiN3:Eu2+ via superficial organic carbon modification. Issue 8 (16th April 2021)

• Record Type: Journal Article
• Authors: Tian, Junhang; Zhuang, Weidong; Liu, Ronghui; Liu, Yuanhong; Chen, Guantong; Chen, Siwei; Jiang, Ze
• Is Part Of: Journal of the American Ceramic Society. Volume 104:Issue 8(2021)
• Page Start: 4014
• Page End: 4023
• Publication Date: 2021-04-16
• Subjects: nitride phosphor -- organic carbon -- superficial modification -- thermal stability; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17809
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The Eu 2+ ‐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 Eu 2+ and the damage of nitride host in the Eu 2+ ‐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 :Eu 2+ 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 Eu 2+ 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 Eu 2+ ‐activated nirtide phosphors.