The Photoluminescence Behaviors of a Novel Reddish Orange Emitting Phosphor CaIn2O4:Sm3+ Codoped with Zn2+ or Al3+ Ions

Jing Gou,Jing Wang,Dongyang Zhang,Binxun Yu,Shengzhong Liu

doi:10.1155/2015/969724

Abstract

A novel reddish orange phosphor CaIn2O4:Sm3+ codoped with Zn2+ or Al3+ ions was prepared by solid state reaction and their luminescence properties were investigated under near ultraviolet excitation. The strategy of Zn2+ or Al3+ ions codoping was used with the aim to improve the luminescence properties of CaIn2O4:Sm3+, but the concrete effects of the two ions is different. The introduction of Zn2+ ions can produce defects that favor charge balance in CaIn2O4:Sm3+ to facilitate its photoluminescence. The effect of Al3+ ions codoping can effectively transfer energy from charge‐transfer absorption band to characteristic transition of Sm3+ ions, utilizing more energy from host absorption for the photoluminescence of Sm3+ ions. Based on these mechanisms, the luminescence intensity of CaIn2O4:0.6%Sm3+ was enhanced to 1.59 times and 1.51 times when codoping amount of Zn2+ and Al3+ ions reached 0.6%. However, the chromaticity coordinates of CaIn2O4:0.6%Sm3+ almost did not have any changes after Zn2+ ions or Al3+ ions codoping; those are still located at reddish orange region. The excellent luminescence properties of CaIn2O4:0.6%Sm3+,0.6%Zn2+ and CaIn2O4:0.6%Sm3+,0.6%Al3+ demonstrate that they both have potential application value as new‐style reddish orange phosphors on light‐emitting diode.

Highlights

White light-emitting diodes (WLEDs), with the advantages of long lifetime, less energy consumption, and environment friendly characteristics, are thought to be the most important solid state light sources for substituting the widely used incandescent lamps and fluorescent lamps [1,2,3,4,5]
It is well known that WLEDs can be realized by combing a single near ultraviolet (NUV, 370–410 nm) light-emitting diodes (LEDs) chip with tricolor phosphors or combining a simple blue LEDs chip with yellow phosphor [6]
In our paper, the luminescence properties of CaIn2O4:0.6%Sm3+ codoped with Zn2+ or Al3+ ions were investigated in detail for basic research and potential application in WLEDs

Summary

Introduction

White light-emitting diodes (WLEDs), with the advantages of long lifetime, less energy consumption, and environment friendly characteristics, are thought to be the most important solid state light sources for substituting the widely used incandescent lamps and fluorescent lamps [1,2,3,4,5]. It is well known that WLEDs can be realized by combing a single near ultraviolet (NUV, 370–410 nm) light-emitting diodes (LEDs) chip with tricolor phosphors or combining a simple blue LEDs chip with yellow phosphor [6]. With the development of semiconductor technology, NUV-LEDs chips can offer a higher efficient solid state light. The corresponding phosphors which can be efficiently excited by NUV urgently needed to be explored, but the red phosphor excited by NUV light is rare at present. Reported The doped be effective to extend and strengthen the absorption of near-UV light with wavelength of 400–405 nm. The research about the luminescence properties of CaIn2O4:Sm3+ under NUV excitation is very significant. In our paper, the luminescence properties of CaIn2O4:0.6%Sm3+ codoped with Zn2+ or Al3+ ions were investigated in detail for basic research and potential application in WLEDs

Experimental Details

Results and Discussion

Conclusion