4 - Ln2 +, 3 +-doped aluminosilicate–based phosphors

Abstract

Phosphor-converted white light-emitting diodes (Pc-WLEDs) have emerged as a possible substitute for the conventional incandescent and fluorescent light sources. Pc-WLEDs have been widely investigated due to their low-energy consumption, long lifetime, and environmental friendly characteristics. Much effort is directed toward improving the photoluminescence properties of the phosphor used in Pc-WLEDs. In this regard, a new type of inorganic phosphors, that is, aluminosilicates, has received great interest due to their possible WLED applications. In this chapter, a short description of the aluminosilicate phosphors and an overview of rare earth ion-doped aluminosilicate phosphors reported in the literature are given. Special attention is given to the results of an experimental research published on rare earth (Ln2+ and Ln3+) ions doped in aluminosilicate hosts. This chapter will cover the rare earth ion-doping effects on the structural, chemical, and photoluminescence properties of Ln2+ and Ln3+ ions doped in aluminosilicate hosts. In addition, this chapter addresses the challenges in the development of the aluminosilicate phosphors and discusses the advantages and disadvantages of several aluminosilicate compositions for blue and near-UV excited Pc-WLEDs. The provided information about aluminosilicate phosphors will further boost the understanding and development of these phosphors.