Strong blue and white photoluminescence emission of BaZrO3 undoped and lanthanide doped phosphor for light emitting diodes application

In this paper, we report the obtained strong broadband blue photoluminescence (PL) emission centered at 427nm for undoped BaZrO3 observed after 266nm excitation of submicron crystals prepared by hydrothermal/calcinations method. This emission is enhanced with the introduction of Tm3+ ions and is str...

Full description

Saved in:
Bibliographic Details
Published in:Journal of solid state chemistry 2012-12, Vol.196, p.243-248
Main Authors: Romero, V.H., De la Rosa, E., Salas, P., Velázquez-Salazar, J.J.
Format: Article
Language:English
Subjects:
Applied sciences
Barium zirconates
BaZrO3
Blue emission
Broadband
Color
Compensation
Cross-disciplinary physics: materials science
rheology
Electronics
Emission
Exact sciences and technology
Growth from solutions
Lanthanides
Materials
Materials science
Methods of crystal growth
physics of crystal growth
Optoelectronic devices
Phosphor
Photoluminescence
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Visible emission
White light
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we report the obtained strong broadband blue photoluminescence (PL) emission centered at 427nm for undoped BaZrO3 observed after 266nm excitation of submicron crystals prepared by hydrothermal/calcinations method. This emission is enhanced with the introduction of Tm3+ ions and is stronger than the characteristic PL blue emission of such lanthanide. The proposed mechanism of relaxation for host lattice emission is based on the presence of oxygen vacancies produced during the synthesis process and the charge compensation due to the difference in the electron valence between dopant and substituted ion in the host. Brilliant white light emission with a color coordinate of (x=0.29, y=0.32) was observed by combining the blue PL emission from the host with the green and red PL emission from Tb3+ and Eu3+ ions, respectively. The color coordinate can be tuned by changing the ratio between blue, green and red band by changing the concentration of lanthanides. Strong blue emission from undoped BaZrO3 phosphor and white light emission by doping with Tb3+ (green) and Eu3+ (red) after 266nm excitation. [Display omitted] ► Blue emission from BaZrO3 phosphor. ► Blue emission enhanced with Tm3+. ► White light from BaZrO3+ phosphor.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2012.06.026