Speaker
Description
Cesium metavanadate (CsVO3) materials have recently received extensive attention due to their out-standing luminescent properties.In this study, the synthesis of CsVO3 and CsVO3:Er3+ was conducted using the solid-state reaction method.Through a thermal treatment at 400°C for 5 hours,the crystalline phase corresponding to PDF 00-70-0680 was obtained,achieving a phase purity ofapproximately 94% CsVO3.
CsVO3 was doped with erbium ions (Er3+) at varying concentrations ranging from 0.1 mol% to 6 mol%,and the structural and luminescent properties of CsVO3:Er3+ were investigated.The incorporation of Er3+ ions induced microstrains within the crystalline structure, altering the position of vanadium tetrahedra and consequently reducing the purity of the crystalline phase.
Excitation spectra of CsVO3:Er3+ were recorded from 200nm to 400nm, with emission monitored at 535nm.The obtained spectra revealed a peak at 355nm, corresponding to the 1A1→1T1 transition associated with (VO4)3−.Additionally, the emission spectra of CsVO3:Er3+ excited at 365 nm exhibited a broad band centered at 536nm,originating from the convolution of emission levels 3T1→1A1 and 3T2→1A1.Furthermore,sinks at 521nm (4I15/2→2H11/2) were observed in the emission spectra,indicating radiative energy transfer from [VO4]3− to Er3+. Moreover,near-infrared emisión under 980 nm excitation displayed a characteristic emission peak centered at 1534 nm, associated with the 4I13/2→4I15/2 transition.
Up-conversion emission peaks characteristic of Er3+, attributed tothe levels Er3+:2H11/2,4S3/2,and 4F9/2→4I15/2,are observed in UC emission spectra under λex=980nm diode laser excitation.The intensity of red emission is considerably higher than that of green.Integrated spectrum areas indicate an intensity growth with Er3+ content,with the 6.0% sample being the most intense.From UC emission spectra,color coordinates were evaluated using the CIE1931 protocol,observing a yellow hue with an average color purity of 98.7.
The optical properties of this material position it as an excellent candidate for enhancing the efficiency of solar cells.
This work was supported by
BUAP, Conahcyt, Mexican Society of Surfaces and Vacuum.
Reference
Espinosa-Cerón, M. Y., Meza-Rocha, A. N., Carmona-Téllez, S., Chacón, C., Soriano-Romero, O., Lozada-Morales, R. (2021). Effect of radiative energy transfer and direct excitation on the up-conversion and down-shifting emission properties of Er3+-doped Zn3(V O4)2. Journal of Luminescence, 238, 118239
| Keywords | Luminescence-Phosphors-Erbium-Cesium-Vanadate |
|---|---|
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