아주대학교

목차

Contents

Acknowlegements i
Abstract ii
Contents v
List of Figures x

Chapter 1 Introduction
1.1 Motivation 1
1.2 Phosphor inorganic luminescence materials 5
1.2.1 The host lattice itself absorbance and luminescence 5
1.2.2 Phosphors composed of a host lattice and an activator 6
1.2.3 Phosphors are semiconductors 10
1.3 Luminescence centers (activators) 11
1.3.1 Luminescence centers of ns2-type ions 12
1.3.2 Luminescence centers of transition metal ions 12
1.3.3 Luminescence centers of rare earth ions 13
1.3.3.1 The 4fn-1 5d1 states and charge-transfer state (CTS)) 14
1.3.3.2 Eu3+ ion luminescence 17
1.3.3.3 Eu2+ ion luminescence 19

Chapter 2 The nano-size Eu3+-activated vanadates as red phosphors for
NUV light emitting diode application 21
2.1 Introduction 21
2.2 Experimental 21
2.2.1 Synthesis for nanosized YVO4:Eu3+, (Y,B i)VO4:Eu3+
and Y(V,P)O4:Eu3+ 23
2.2.2 Measurement 25
2.3 Results and Discussion 27
2.3.1 Structure of YVO4, (Y,Bi)VO4 and Y(V,P)O4 27
2.3.2 Photoluminescence properties of nanosized YVO4:Eu3+,
(Y,Bi)VO4:Eu3+ and Y(V,P)O4:Eu3+ 34
2.4 Conclusion 41

Chapter 3 The luminescent characteristics of yellow silicate phosphors
for white light emitting diodes 42
3.1 Introduction 42
3.2 Experimental 44
3.2.1 Synthesis of Sr2SiO4:Eu2+; (Sr,R)2SiO4:Eu2+ (R = Ba2+, Ca2+);
Sr2SiO4:Eu2+,M3+ (M = Ce3+, La3+) 44
3.2.2 Measurement 46
3.3 Results and Discussion 47
3.3.1 The structure and photoluminescent properties of
Sr2SiO4:Eu2+ 47
3.3.2 Photoluminescent properties of (Sr,R)2SiO4:Eu2+
(R = Ba2+, Ca2+) and Sr2SiO4:Eu2+,M3+ (M = Ce3+, La3+) 56
3.3.3 The identification of two sites for the Eu2+ luminescence
in the Sr2SiO4 lattices 62
3.4 Conclusion 65

Chapter 4 The luminescent properties of double perovskite and
pyrochore activated by Eu3+ as new orange-red emitting phosphors 66
4.1 Introduction 66
4.2 Experimental 69
4.2.1 Synthesis of Double peroveskite Ba2Bi2/3TeO6:Eu3+ and
BaBiNaTeO6:Eu3+ 69
4.2.2 Synthesis of Pyrochlore Bi2TiNbO7:Eu3+ 70
4.2.3 Measurements 70
4.3 Results and Discussion 72
4.3.1 Double perovskite Ba2Bi2/3TeO6:Eu3+ and
BaBiNaTeO6:Eu3+ 72
4.3.1.1 Structure of Ba2Bi2/3TeO6 (A2BB？O6) and
BaBiNaTeO6 (AA？BB？O6) 72
4.3.1.2 Photoluminescent properties of Ba2Bi2/3TeO6:Eu3+
and BaBiNaTeO6:Eu3+ 79
4.3.2 Pyrochore Bi2TiNbO7:Eu3+ 89
4.3.2.1 Structure of Bi2TiNbO7 89
4.3.2.2 The photoluminescence of Bi2TiNbO7:Eu3+ 94
4.4 Conclusion 96

Chapter 5 Anodic aluminum oxide membranes for non-linear optical
properties and improve the light extraction of LEDs 98
5.1 Introduction 98
5.2 The self-organized periodic pore growth of anodic alumina
membranes 100
5.3 Experimental 103
5.3.1 Synthesis of anodic aluminum oxide (AAO) membranes 103
5.3.2 Measurements 104
5.4 Results and Discussion 105
5.4.1 Anodic aluminum oxide (AAO) membranes 105
5.4.2 The CL properties of LED with nanoporous structures
on the surface 110
5.5 Conclusion 115

Chapter 6 Conclusions 116

References 120

Curriculum vitae 128