Facile synthesis of Ca-α-SiAlON:Eu2+ phosphor by the microwave sintering method and its photoluminescence properties

Abstract

Pure Ca--SiAlON:Eu 2+ was synthesized by microwave sintering method at a relatively low temperature of 1550°C. Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by conventional gas-pressure sintering technique at 1750°C. When it was excited at 450 nm, the as-prepared yellow Ca--SiAlON:Eu 2+ sample had an external quantum efficiency of 42%, comparable to the sample synthesized at 1750°C under 0.5 MPa N 2 gas pressure by the GPS method reported in reference. The experimental results demonstrated that the microwave sintering method was also an interesting approach for synthesizing nitride phosphors, which promises lower firing temperature than those by carbothermal reduction and nitridation (CRN) methods, higher heating rate and shorter duration time compared with those by gas-pressure sintering.

Co-doping effect of Mn2+ on fluorescence thermostability of Ca-α-sialon:Eu2+ phosphors

“…12 Besides the wider emission wavelength range and high thermal stability, compared with other oxide and oxynitride phosphors (e.g., BaSi 3 O 4 N 2 , 13 BaMgAl 10 O 17 , 14 and so on), Eu 2+ or Ce 3+ doped Ca-a-sialon possesses a high external quantum efficiency (QE) of about 40%. 15,16 Furthermore, relative to nitride phosphors CaAlSiN 3 17 which have complex requirements to prepare, Ca-a-sialon phosphor is easier to prepare.…”

Effects of Ca Content on Formation and Photoluminescence Properties of CaAlSiN3:Eu2+ Phosphor by Combustion Synthesis

“…In addition, note that the XRD angles of AlN and AlN:Eu 2+ are very close to each other and thus the two compounds cannot be distinguished on XRD patterns [13,14,15]. The same is the case of Ca-α-SiAlON and Ca-α-SiAlON:Eu 2+ [16,17,18]. ) The XRD peak intensity of CASIN is seen to increase with increasing Y to a maximum at Y = 1.50 but begins to decrease as Y is further increased to 1.68, indicating that the formation of CASIN continuously increases as the Ca content is increased from 0.25 to 1.50 but begins to decrease as the Ca content is further increased to 1.68.…”

Microwave Sintering of SiAlON Ceramics with TiN Addition

“…Since sintering of the silicon nitride based composites involves a high temperature operation, often exceeding 1600–1750 °C [11], there is high interest in a technique able to decrease such temperatures and to speed up the process. However, the presence of other materials during microwave sintering, like the insulating materials and possible use of susceptors, plays a critical role in the successful microwave processing of this low lossceramic [12,13,14,15,16,17]. In particular, susceptor-assisted microwave heating (also referred as hybrid microwave heating) of ceramic materials is relevant to SiAlON processing because it allows to improve the coupling of microwaves at low temperature with a low loss ceramic by either using high loss external susceptors or adding lossy conductive or magnetic materials in the form of secondary phases [18].…”