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PUKYONG Repository 대학원 의생명융합공학협동과정

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Alternative Title: Combustion Synthesis and Luminescence Properties of Sr3La2(BO3)4:Eu3+ Phosphors

Abstract: A series of Sr3La2(1-x)(BO3)4:xEu3+ (0.01≤x≤1.00) nanocrystalline phosphors was prepared by a novel technique which is a slight variation of solution combustion synthesis. The synthesis is based on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate). The XRD analysis confirmed the formation of the solid solution between Sr3La2(BO3)4 and Sr3Eu2(BO3)4. The typical structure diffraction peaks of different Eu content Sr3La2(BO3)4 reveal a systematic shift to high diffraction angle. The morphology was determined with Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). It was found that the size of nanocrystallites were around 50-60 nm. The excitation, emission spectra and decay curves are reported. The photoluminescence spectra showed that the samples had intense and prevailing red emission at 612 nm belonging to the 5D0→7F2 electric dipole transition. The Eu concentration plays a significantly affect to the luminescence properties. In addition, the thermal stability of phosphor was also investigated, the results showed the emission intensity of Eu3+-activated phosphors decreased with increased temperature and the emission wavelengths showed no shift with increased temperature. It is indicated that this kind of phosphors can be served as a potential red-emitting phosphor for W-LEDs.

Publisher: Pukyong National University Department of physics and Interdisciplinary Program of Biomedical, Mechanical & Electrical Engineering

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/12680
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002071105

Affiliation: Pukyong National University Department of physics and Interdisciplinary Program of Biomedical, Mechanical & Electrical Engineering

Table Of Contents: List of Figures ii
List of Tables iii
Abstract iv
1. Introduction 1
2. Background and Theory 7
2.1. A general introduction to luminescence 7
2.2. Luminescence properties and energy level splitting of Eu3+ ions 11
2.3. The luminescence decay 13
2.4. The crystal structure of Sr3La2(BO3)4 14
2.5. A general guidelines for X-ray diffraction 16
3. Sample preparation and spectroscopic measurement 19
3.1. Experimental chemical reagents 19
3.2. Sample preparation 20
3.3. Characterization 23
4. Results and discussion 26
4.1. Structure and morphology 26
4.1.1. X-ray diffraction patterns of Sr3La2(BO3)4 26
4.1.2. Morphology and size distribution analysis 30
4.1.3. Crystal phase formation 34
4.2. Luminescence properties of Sr3La2 (BO3)4: Eu3+ 36
4.2.1. Excitation and emission spectra 36
4.2.2. Decay and concentration quenching 48
4.2.3. Thermal quenching of luminescence 54
5. Summary and Conclusions 56
Acknowledgement 57
Reference 58

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