Ortho-vanadates K3RE(VO4)2 (RE = La, Pr, Eu, Gd, Dy, Y) for near UV-converted phosphors
Creators
- 1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China)
- 2. Department of Physics and Center for Marine-Integrated Biomedical Technology, Pukyong National University, Busan 608-737 (Korea, Republic of)
Description
The orthovanadate poly-crystals K3RE(VO4)2 (RE = La, Pr, Eu, Gd, Dy, Y) were synthesized via the solid-state reaction route. The crystal phase formation was verified through X-ray diffraction (XRD) studies and was performed by structural refinements. The optical properties were also investigated in detail. K3RE(VO4)2 (RE = Eu, Dy, Gd, Pr, La, Y) phosphors present different luminescence behaviors: the profiles of excitation and emission spectra, the spectra shift, the luminescence decay lifetimes, the absolute quantum efficiency (QE), and the CIE color coordinates are very different. The luminescence of K3RE(VO4)2 (RE = La, Gd, Y, Pr) presents yellow or yellowish green color, while, K3Dy(VO4)2 and K3Eu(VO4)2 show white and red luminescence, respectively. This was discussed on the base of the different micro-structure, activator centers, and the charge transfer transitions from [VO4]3− groups in the lattices. K3Y(VO4)2 and K3Eu(VO4)2 show higher QE values of 47.0% and 45.0% at room temperature, respectively. All the phosphors have efficient absorption in the region of near-UV wavelengths or blue wavelength region. This can well match with the light from UV-LED (360–400 nm) or blue LED chips (450–480 nm) based on GaN semiconductor. K3RE(VO4)2 could be suggested to be a potential candidate to give further investigations for the application on near-UV excited white LEDs. - Graphical abstract: A series of orthovanadates K3RE(VO4)2 (RE = Eu, Dy, Gd, Pr, La, Y) have been developed to be new phosphors with rich luminescence colors; there are efficiency excitation in the near UV wavelength region. Compared with the reported vanadate phosphors K3R(VO4)2 has rich luminescence color, rich color, no concentration quenching, and comparable luminescence QE. - Highlights: • A new phosphor of non-doped of K3R(VO4)2 (R = Eu, Dy, Gd, Pr, La, Y) were developed by solid-state reaction route. • The phosphor has efficiency excitation in the near UV wavelength region. • Compared with the reported vanadate phosphors K3R(VO4)2 has rich luminescence color and comparable luminescence QE
Availability note (English)
Available from http://dx.doi.org/10.1016/j.matchemphys.2014.07.006Additional details
Identifiers
- DOI
- 10.1016/j.matchemphys.2014.07.006;
- PII
- S0254-0584(14)00432-5;
Publishing Information
- Journal Title
- Materials Chemistry and Physics
- Journal Volume
- 147
- Journal Issue
- 3
- Journal Page Range
- p. 1195-1203
- ISSN
- 0254-0584
- CODEN
- MCHPDR
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 46104149
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; CRYSTALS; DOPED MATERIALS; DYSPROSIUM COMPOUNDS; EMISSION SPECTRA; EUROPIUM COMPOUNDS; EXCITATION; GADOLINIUM COMPOUNDS; LANTHANUM COMPOUNDS; LIFETIME; LUMINESCENCE; MICROSTRUCTURE; PHOSPHORS; POTASSIUM VANADATES; QUANTUM EFFICIENCY; SEMICONDUCTOR MATERIALS; X-RAY DIFFRACTION; YTTRIUM COMPOUNDS
- Descriptors DEC
- ALKALI METAL COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; DIMENSIONLESS NUMBERS; EFFICIENCY; EMISSION; ENERGY-LEVEL TRANSITIONS; EVALUATION; MATERIALS; OXYGEN COMPOUNDS; PHOTON EMISSION; POTASSIUM COMPOUNDS; RARE EARTH COMPOUNDS; SCATTERING; SPECTRA; TRANSITION ELEMENT COMPOUNDS; VANADATES; VANADIUM COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.