Luminescent properties of lithium-indium oxide doped with rare earth ions

Abstract

<p>Predmet istraživanja ove doktorske disertacije&nbsp;su prahovi litijum-indijum oksida dopirani&nbsp;različitim jonima retkih zemalja (Eu³⁺; Sm³⁺;&nbsp;Er³⁺; Yb³⁺), sintetisani reakcijom u &nbsp;čvrstoj fazi.&nbsp;Litijum-indijum oksid ima raznovrsne&nbsp;potencijalne primene u viduscintilatora, &nbsp;matrice&nbsp;fosfora za jone retkih zemalja, za&nbsp; čuvanje i&nbsp;konverziju energije i u fotokatalizi. U&nbsp;<br />istraživanju je ustanovljena optimalna metoda&nbsp;sinteze fazno&nbsp; čistih prahova novih fosfora&nbsp;<br />LiInO₂:RE^3+&nbsp;i izvr&scaron;ena njihova detaljna&nbsp;karakterizacija primenom difrakcije X-zraka,&nbsp;<br />skenirajuće elektronske mikroskopije,&nbsp;termogravimetrije i diferencijalno termijske&nbsp;analize, Ramanske spektroskopije i difuzno-refleksione spektroskopije. &nbsp;Fotoluminescentna&nbsp;spektroskopija je primenjena u cilju ispitivanja&nbsp;osobina presudnih za &nbsp;primenu ovih materijala.&nbsp;Emisioni spektri i vrednosti vremena života&nbsp;pokazuju efikasne potencijalne fosfore, dok&nbsp;ispitivanja emisije uzorka LiInO₂:Er^3+&nbsp;na&nbsp;različitim temperaturama ukazuju na to da je u&nbsp;pitanju veoma dobar temperaturni senzor u&nbsp;<br />oblasti temperatura (10-300) K.</p>

<p>The subject of this dissertation are powders of&nbsp;lithium-indium oxide doped with different rare&nbsp;earth ions (Eu³⁺; Sm³⁺; Er³⁺; Yb³⁺), synthesized&nbsp;by solid-state reaction. Lithium-indium oxide&nbsp;has a variety of potential applications in the&nbsp;form of scintillators, phosphor matrixes for rare-earth ions, storage and energy conversion&nbsp;devices and photocatalysts. In this study the&nbsp;optimal method of synthesis of pure-phased&nbsp;powders of new phosphors LiInO₂:RE^3+&nbsp;was&nbsp;determined. Also, their detailed characterization&nbsp;<br />using the X-ray diffraction, scanning electron&nbsp;microscopy, thermogravimetry and &nbsp;differential&nbsp;thermal analysis, Raman spectroscopy and&nbsp;diffuse-reflection spectroscopy &nbsp;was performed.&nbsp;Photoluminescence spectroscopy was applied to&nbsp;investigate the properties crucial for the&nbsp;application of these materials. Emission spectra&nbsp;and lifetime values, showed these materials are&nbsp;potential efficient phosphors. Examining the&nbsp;emission of LiInO₂:Er^3+&nbsp;sample at different&nbsp;temperatures indicated that this is a very good&nbsp;temperature sensor in the temperature range (10-300) K.</p>