Luminescentna svojstva litijum-indijum oksida dopiranog jonima retkih zemalja

Abstract

Predmet istraživanja ove doktorske disertacije su prahovi litijum-indijum oksida dopirani različitim jonima retkih zemalja (Eu3+; Sm3+; Er3+; Yb3+), sintetisani reakcijom u čvrstoj fazi. Litijum-indijum oksid ima raznovrsne potencijalne primene u viduscintilatora, matrice fosfora za jone retkih zemalja, za čuvanje i konverziju energije i u fotokatalizi. U istraživanju je ustanovljena optimalna metoda sinteze fazno čistih prahova novih fosfora LiInO2:RE3+ i izvršena njihova detaljna karakterizacija primenom difrakcije X-zraka, skenirajuće elektronske mikroskopije, termogravimetrije i diferencijalno termijske analize, Ramanske spektroskopije i difuzno-refleksione spektroskopije. Fotoluminescentna spektroskopija je primenjena u cilju ispitivanja osobina presudnih za primenu ovih materijala. Emisioni spektri i vrednosti vremena života pokazuju efikasne potencijalne fosfore, dok ispitivanja emisije uzorka LiInO2:Er3+ na različitim temperaturama ukazuju na to da je u pitanju veoma dobar temperaturni senzor u oblasti temperatura (10-300) K.

The subject of this dissertation are powders of lithium-indium oxide doped with different rare earth ions (Eu3+; Sm3+; Er3+; Yb3+), synthesized by solid-state reaction. Lithium-indium oxide has a variety of potential applications in the form of scintillators, phosphor matrixes for rare-earth ions, storage and energy conversion devices and photocatalysts. In this study the optimal method of synthesis of pure-phased powders of new phosphors LiInO2:RE3+ was determined. Also, their detailed characterization using the X-ray diffraction, scanning electron microscopy, thermogravimetry and differential thermal analysis, Raman spectroscopy and diffuse-reflection spectroscopy was performed. Photoluminescence spectroscopy was applied to investigate the properties crucial for the application of these materials. Emission spectra and lifetime values, showed these materials are potential efficient phosphors. Examining the emission of LiInO2:Er3+ sample at different temperatures indicated that this is a very good temperature sensor in the temperature range (10-300) K.