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Chapter 278 Rare Earth-Doped Phosphors for White Light-Emitting Diodes M. Sato*,1, S.W. Kim†, Y. Shimomura{, T. Hasegawa†, K. Toda† and G. Adachi§ *Faculty of Engineering, Niigata University, Niigata, Japan †Graduate School of Science and Technology, Niigata University, Niigata, Japan ‡Mitsubishi Chemical Corporation, Odawara, Kanagawa, Japan §Faculty of Engineering, Osaka University, Suita, Osaka, Japan 1Corresponding author: e-mail: msato@eng.niigata-u.ac.jp Chapter Outline 1 Introduction 2 2 What is LED Lighting? 4 2.1 Principle of White Light Generation in LEDs 4 2.2 Types of LED Lighting Devices 5 2.3 Color Evaluation Indices 6 3 Phosphor Requirements for LED Lighting 9 3.1 Features of Rare Earth Ions with Respect to Luminescence 9 3.2 Crystal-Field Effects on Luminescence 14 4 Phosphor Materials for White LEDs 15 4.1 Oxides 15 4.2 (Oxy)nitrides 40 4.3 Sulfides and Oxysulfides 63 4.4 Oxyhalides 67 4.5 Energy Transfer Type Phosphors 74 Handbook on the Physics and Chemistry of Rare Earths, Vol. 49. http://dx.doi.org/10.1016/bs.hpcre.2016.03.001 © 2016 Elsevier B.V. All rights reserved. 1 5 6 Synthesis Methods of White LED Phosphors 78 5.1 Oxides 78 5.2 (Oxy)nitrides 82 5.3 Sulfides 86 5.4 Halides 87 Implementing Phosphors in White LED Lamps 88 6.1 Conventional LED Packaging 88 6.2 Improvements for Conventional Dispensing Process 88 6.3 Chip-on-Board 89 6.4 Remote Phosphor 90 6.5 Technologies for Wafer-Level Packaging 92 7 Tabulation of Luminescence Data of Phosphors for White LEDs 92 Concluding Remarks 92 8 References 105PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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