Thermoluminescence and Photoluminescence Study of Erbium Doped CaY2O4 Phosphor

Vikas Dubey,Raunak Kumar Tamrakar,Ratnesh Tiwari,Mahendra Kumar Pradhan,Gajendra Singh Rathore,Chandrabhushan Markande

doi:10.1155/2015/745052

Abstract

Phosphor doped with erbium ion with variable concentration (0.5–2 mol%) was synthesized by solid state reaction method. CaY2O4:Er3+ phosphor is characterized by X-ray diffraction technique for structural analysis and crystallite size calculation. Average crystallite size was found to be nearly 58 nm. Two prominent TL glow peaks found at 163°C associated with higher temperature peak 340°C. The peak intensity of higher temperature (340°C) peak was less as compared to lower temperature peak (163°C) because the deep trapping formation is less in case of UV irradiation. Sample shows good TL glow curve and for variable UV exposure time maximum TL intensity was found at 20 min UV exposure which is optimized UV exposure time. Sample was studied by photoluminescence emission spectra excited by xenon flash lamp with nearly 360 nm and four prominent peaks found at wavelengths 445, 525, 553, and 565 nm; here the 445 and 565 nm peak were intense as compared to others. From the PL emission spectra, it is concluded that the color tenability of prepared CaY2O4:Er3+ was blue-green and it is verified by CIE coordinate. Kinetic parameters of prepared phosphor were calculated by computerized glow curve deconvolution (CGCD) technique.

Highlights

In recent years, practical applications in optical devices, such as color display, optical data storage, biomedical diagnostics, and temperature sensors, have been produced on the basis of rare earth ion doped materials [1, 2]
CaY2 O4 belongs to the ordered CaFe2 O4 structure, which is composed of a (R2 O4 )2− (R is rare earth metal) framework of double octahedral structure with rare earth ions residing within the framework
Due to the thermal and chemical stability, CaY2 O4 has been used in thermal barrier coating (TBC) materials [3, 4]

Summary

Introduction

Practical applications in optical devices, such as color display, optical data storage, biomedical diagnostics, and temperature sensors, have been produced on the basis of rare earth ion doped materials [1, 2]. The luminescence properties of rare earth ions in CaY2 O4 have attracted much attention. The paper describes synthesis of rare earth doped phosphor which may be applicable for display devices applications. The object of the present investigation is to report the results of luminescence studies in terms of photoluminescence and thermoluminescence properties of CaY2 O4 :Er3+. Phosphor with variable concentration of erbium ions. To the best of our knowledge and on the basis of literature survey suggestions, it is claimed that this paper attempts to address the PL and TL studies for the first time

Experimental

Results and Discussion

Conclusion

Conflict of Interests