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.
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
This work was supported by
BUAP, Conahcyt, Mexican Society of Surfaces and Vacuum.
| Keywords | Luminescence-Phosphors-Erbium-Cesium-Vanadate |
|---|---|
| Author approval | I confirm |
| Author will attend | I confirm |
