Upconversion emission in (Ln,Yb):KLu(WO4)2 nanocrystals for white light generation

21st Latin American Symposium on Solid State Physics

Barrera, E.W.^1 ; Pujol, M.C.^1 ; Carvajal, J.J.^1 ; Mateos, X.^1 ; Solé, R.^1 ; Massons, J.^1 ; Speghini, A.^2 ; Bettinelli, M.^2 ; Cascales, C.^3 ; Aguiló, M.^1 ; Díaz, F.^1

Física i Cristallografia de Materials i Nanomaterials (FiCMA-FiCNA-EMaS), Universitat Rovira i Virgili (URV), Campus Sescelades, c/ Marcel.lí Domingo, s/n, E-43007 Tarragona, Spain^1

Dipartimento di Biotecnologie, Università di Verona, INSTM, Strada Le Grazie 15, 37134 Verona, Italy^2

Instituto de Ciencia de Materiales de Madrid, CSIC, calle Sor Juana Inés de la Cruz, Cantoblanco, E-28049 Madrid, Spain^3

关键词: CIE chromaticity;    Double tungstates;    Emission cross section;    Low concentrations;    Physical mixtures;    Up-conversion emission;    Upconversion emission properties;    White-light generation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/480/1/012005/pdf
DOI  :  10.1088/1742-6596/480/1/012005

来源: IOP

【 摘 要 】

Optical active lanthanides ions in double tungstates exhibit high emission cross section with low concentration quenching. Production of double tungstates nanocrystals doped with lanthanide ions is suitable for applications in white light emitters if high quantum yield is reached. In this work lanthanide doped (Ln:Yb):KLu(WO4)2nanocrystals (Ln Er, Tm, Ho) upconversion emission properties have been study after 980 nm diode laser excitation at 14-334 W/cm2. From CIE chromaticity theory a possible mixture weight ratio to obtain a white light emitter powder was predicted. Luminescence under 980 nm of the (Ln:Yb):KLu(WO4)2nanocrystals was study and decay times under 460 nm was measured. Reduction of the upconversion quantum yield was observed in the case of physical mixture of nanocrystals.