The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu²⁺Plate Phosphor

Abstract

Plate-type phosphor is a promising substitute in overcoming the issues related to the powder phosphor paste mixed with resin. In this research, Ca-α-SiAlON:Eu 2+ plate phosphor (Ca x Si 12-(m+n) Al m+n O n N 16-n :Eu y) was investigated for the varied compositions (m,n) of the host crystal with the fixed Eu content (y). Densification was promoted for the compositions with increasing 'm' values for the m=2n relationship. Dictated by the Eu concentration inside the phosphor crystal, photoluminescence intensity was stronger in α2 specimen (m = 3.0, n = 1.5) containing the second phases when compared to α1 specimen (m = 1.5, n = 0.75) comprising a single-phase α-SiAlON. The concentration of Eu in the non-emitting amorphous interfacial glass phase was 2~4 times of the designed Eu concentration inside the α-SiAlON crystal.

Layered Ceramic Phosphors Based on CaAlSiN3:Eu and YAG:Ce for White Light‐Emitting Diodes

“…Ceramic converters based on oxide phosphors, mainly on green‐emitting YAG:Ce garnets are well‐known. They are generally produced by solid‐state sintering under vacuum starting from various precursors, or by vacuum sintering of phosphor powders …”

“…They are generally produced by solid-state sintering under vacuum starting from various precursors, [11][12][13] or by vacuum sintering of phosphor powders. 14 To obtain high-quality warm-white light, blue light-excited diodes with YAG:Ce converters require the addition of red emission phosphors, such as the above described CaAlSiN 3 : Eu.…”