The Role of Aluminium Source (Al sub(2) O sub(3)/AlN) in the Synthesis of the Ca-[alpha]-SiAlON:Eu super(2+) Phosphor

The purpose of the presented research was to compare the effect of changing the aluminium source in the mixture of initial powders on the properties of the final phosphor powder of Ca - [alpha]-SiAlON doped with Eu super(2+). The phosphor composition was designed as Eu sub(0,048) Ca sub(0,752) Si su...

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Veröffentlicht in:Key Engineering Materials 2016-07, Vol.697, p.311-317
Hauptverfasser: Pawlik, Tomasz, Michalik, Daniel, Sopicka-Lizer, Malgorzata, Miczek, Aleksandra, Krzywda, Pawel, Lisiecki, Radoslaw
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container_end_page 317
container_issue
container_start_page 311
container_title Key Engineering Materials
container_volume 697
creator Pawlik, Tomasz
Michalik, Daniel
Sopicka-Lizer, Malgorzata
Miczek, Aleksandra
Krzywda, Pawel
Lisiecki, Radoslaw
description The purpose of the presented research was to compare the effect of changing the aluminium source in the mixture of initial powders on the properties of the final phosphor powder of Ca - [alpha]-SiAlON doped with Eu super(2+). The phosphor composition was designed as Eu sub(0,048) Ca sub(0,752) Si sub(9,6) Al sub(2,4) O sub(0,8) N sub(15,2) and it was prepared by the solid state reaction in a temperature range of 1450-1650 [degrees]C. AlN and/or [eta]-Al sub(2) O sub(3) powders were used as a source of aluminium sub(.) It has been found that presence of aluminium nitride or oxide in the mixture of initial materials significantly changed the course of [alpha]-sialon formation, chemical composition of that solid solution and the resultant photoluminescence properties. It has been established that a small amount of [eta]-Al sub(2) O sub(3) with a suitable carbon addition was profitable for liquid formation and enhanced crystallization of Ca,Eu-[alpha]-sialon. The excessive oxide-rich liquid at reaction temperature led to sintering of phosphor particles and decreased emission intensity while lack of sufficient amount of liquid (nitrogen-rich starting composition) resulted in AlN presence and considerably reduced emission intensity of this phosphor.
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subjects Aluminum
Aluminum nitride
Emissions control
Formations
Liquids
Oxides
Phosphors
Solid solutions
title The Role of Aluminium Source (Al sub(2) O sub(3)/AlN) in the Synthesis of the Ca-[alpha]-SiAlON:Eu super(2+) Phosphor
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