Photoluminescence and energy transfer of YAG: Ce3+, Gd3+, Bi3+

Meidan Que,Lingbing Kong,Jinyou Shao,Wenxiu Que,Ting Zhou

doi:10.1142/s2010135x16500296

Meidan Que, Lingbing Kong + Show 3 more

Open Access

https://doi.org/10.1142/s2010135x16500296

Copy DOI

Abstract

In this study, Gd[Formula: see text] and Bi[Formula: see text] ions act to redshift the emission band to orange region, and to enhance significantly the maximum emission of YAG: Ce[Formula: see text]. On account that size mismatch between the host and the doped Gd[Formula: see text] ion, the crystal structure turns soft, and the emission spectra are not tuned from 540 to 570[Formula: see text]nm but decreased the emission intensity. Accordingly, an effective way to increase emission intensity is to introduce Bi[Formula: see text] ion into the YAG: Ce[Formula: see text], Gd[Formula: see text] phosphors. Experimental results show partial overlapping between the emission band of Bi[Formula: see text] ion and the excitation band of Ce[Formula: see text] ion, indicating that the energy transfer from Bi[Formula: see text] to Ce[Formula: see text] ions exists in the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor. Bi[Formula: see text] ion can serve as the activator to provide energy for Ce[Formula: see text] ion via cross relaxation phenomenon. Therefore, the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor could have potential applications in warm white LEDs.

Highlights

Yttrium aluminum garnet (Y3Al5O12, YAG) has been familiar as one of the most general phosphor host materials
The X-ray diffraction (XRD) pattern of the (Y2:94Ce0:06ÞAl5O12 is concident with JCPDS card (No 33-0040),[22] manifesting that Ce3þ ions are incorporated into the YAG host lattice without altering the primary structure of YAG
The co-doping of Ce3þ and Gd3þ ions have no clear influence on the crystal structure of host, the shift impacts the following luminescent behaviors

Summary

Introduction

Yttrium aluminum garnet (Y3Al5O12, YAG) has been familiar as one of the most general phosphor host materials. Based on the survey in the literatures, Bi3þ ion can be used as a sensitizer to improve the emission intensity of some materials.[16,17] some previous work reported about the luminescent properties that Bi3þ ion was co-doping with other RE3þ ion activators, and energy transfer between Bi3þ and RE3þ ions occurred, like YSiO5: Bi3þ, YSiO5: Bi3þ, Eu3þ,18 Dy3þ;19 YVO4: Bi3þ, Sm3þ,20 and CaSrS: Bi3þ, Tm3þ.21. Bi3þ ion influence on the luminescence characteristics of YAG: Ce3þ phosphor has rarely been studied in the literature. This is an Open Access article published by World Scientific Publishing Company. The Bi3þ ion effects on the luminescence properties of (Y1:94Ce0:06Gd)Al3O12 phosphor and the energy transfer from Bi3þ to Ce3þ ions in YAG host, which were studied in detail

Experimental Details

Results and Discussion

Conclusions