Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

Abstract

A hard template route has been successfully developed for synthesis of b-SiAlON:Eu phosphors at low temperatures. The synthesis utilizes mesoporous silica (SBA-15) skeleton as an active Si source, combined with the carbothermal reduction and nitridation method. It has been shown that the additional driving force from high surface area and porosity of SBA-15 enables b-SiAlON:Eu (with compositions ofxEu, x = 0.010-0.200 and z = 1.000) phosphors to be formed as a dominant phase at low temperature of 1400°C. The resultant b-SiAlON:Eu phosphor powders exhibit a typical rod-like morphology and a well dispersed state. By tailoring the Eu 2+ concentration in the phosphors, a continuous change in emission band can be realized, that is a blue emission dominated for low Eu 2+ concentrations and a green emission dominated for high Eu 2+ doping concentrations. Furthermore, the resultant phosphors exhibit a small thermal quenching up to high temperature of 250°C. Therefore, the developed method is beneficial to synthesize LED phosphors of oxynitride systems at lower temperatures.

Effect of Different Heating Process on the Photoluminescence Properties of Perovskite Eu-Doped BaZrO3 Powder

“…The low Eu 2+ concentrations would cause the β-SiAlON:Eu phosphors to have a blue emission and the high Eu 2+ -doping concentrations would cause the β-SiAlON:Eu phosphors to have a green emission [13]. Zambare and Murthy adopted a standard solid-state reaction method to investigate the properties of Eu-doped YPVO 4 , Y 2 O 3 , and YLaVO 4 phosphors [14].…”

Preparation and property of β-SiAlON:Eu2+ luminescent fibers by an electrospinning method combined with carbothermal reduction nitridation

“…While the uncommon blue emission at 470 nm has been found in the β-SiAlON compositions having a higher Al content and it was supposed to relate to the local fluctuation of the O/N ratio caused by more Al-O bonds substituting Si-N bonds in SiAlON compositions [4,23]. In our previous research [19], the blue emission was also found in Eu-doped β-SiAlON phosphors prepared via a hard template assistant route, in which the Eu 2 þ content is less than 2.5 at%.…”

“…According to our previous work on β-SiAlON powder fabrication via carbothermal reduction nitridation (CRN) processing, sucrose (C 12 H 22 O 11 , high molecular weight 342) is a highly active agent to catalyze the nitridation of precursors [18,19]. Therefore, the sucrose was selected as a reducing agent in our electrospinning experiments.…”

A Novel Synthesis of Green Apatite‐Type Y5(SiO4)3N:Eu2+ Phosphor via SiC‐Assisted Sol–Gel Route

“…High temperature is usually required for SSR because the raw material Si 3 N 4 has low diffusion coefficient for reaction, and reducing gases (e.g., NH 3 , CH 4 , or N 2 –H 2 ) are essential in GRN to remove oxygen in raw materials partially or completely. On the other hand, it is more facile for CRN which only uses carbon as reductant . The disadvantage of CRN, however, is that the residual carbon cannot be removed completely so that the emission intensity and absorption efficiency of phosphors are low.…”

“…On the other hand, it is more facile for CRN which only uses carbon as reductant. 10 The disadvantage of CRN, however, is that the residual carbon cannot be removed completely so that the emission intensity and absorption efficiency of phosphors are low. Here, we develop a novel SiC reduction method to synthesize silica-based oxynitride phosphors without residual carbon problem and the SiC reduction is more tolerant to experimental conditions.…”