TY - JOUR
T1 - Novel orange and reddish-orange color emitting BaGd2O 4:Sm3+ nanophosphors by solvothermal reaction for LED and FED applications
AU - Seeta Rama Raju, G.
AU - Yu, Jae Su
PY - 2014/4/24
Y1 - 2014/4/24
N2 - BaGd2O4 (BG):Sm3+ nanophosphors were synthesized by a solvothermal reaction method. The powder X-ray diffraction pattern confirmed their orthorhombic structure, and the morphological studies were carried out by taking the scanning and transmission electron microscopy images. The photoluminescence (PL) emission and PL excitation (PLE) spectra were investigated as a function of Sm3+ ion concentration. The PLE spectra revealed both Gd3+ and Sm3+ excitation bands in the shorter and longer wavelength regions, indicating that the efficient energy transfer occurred from the Gd3+ to Sm3+ ions in the BG host lattice. The PL spectra exhibited an intense orange emission due to ( 4G5/2 → 6H7/2) transition along with two other moderate intense emission peaks due to the (4G 5/2 → 6H5/2) and (4G 5/2 → 6H9/2) transitions. Based on the emission performance related to (4G5/2 → 6H7/2) transition, the Sm3+ ion concentration was optimized to be at 1 mol%. The low-voltage cathodoluminescent (CL) measurements were also performed for BG:1 mol% Sm3+ nanophosphors as a function of accelerating voltage and filament current. From the CL spectra, the reddish-orange emission was observed. The Commission International De I-Eclairage chromaticity coordinates of BG:Sm3+ nanophosphors were found to be very close to the chromaticity coordinates of Nichia Corporation developed amber light-emitting diodes.
AB - BaGd2O4 (BG):Sm3+ nanophosphors were synthesized by a solvothermal reaction method. The powder X-ray diffraction pattern confirmed their orthorhombic structure, and the morphological studies were carried out by taking the scanning and transmission electron microscopy images. The photoluminescence (PL) emission and PL excitation (PLE) spectra were investigated as a function of Sm3+ ion concentration. The PLE spectra revealed both Gd3+ and Sm3+ excitation bands in the shorter and longer wavelength regions, indicating that the efficient energy transfer occurred from the Gd3+ to Sm3+ ions in the BG host lattice. The PL spectra exhibited an intense orange emission due to ( 4G5/2 → 6H7/2) transition along with two other moderate intense emission peaks due to the (4G 5/2 → 6H5/2) and (4G 5/2 → 6H9/2) transitions. Based on the emission performance related to (4G5/2 → 6H7/2) transition, the Sm3+ ion concentration was optimized to be at 1 mol%. The low-voltage cathodoluminescent (CL) measurements were also performed for BG:1 mol% Sm3+ nanophosphors as a function of accelerating voltage and filament current. From the CL spectra, the reddish-orange emission was observed. The Commission International De I-Eclairage chromaticity coordinates of BG:Sm3+ nanophosphors were found to be very close to the chromaticity coordinates of Nichia Corporation developed amber light-emitting diodes.
KW - BaGdO
KW - Cathodoluminescent properties
KW - Photoluminescent properties
KW - Solvothermal synthesis
UR - http://www.scopus.com/inward/record.url?scp=84893616661&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2014.01.016
DO - 10.1016/j.saa.2014.01.016
M3 - Article
C2 - 24508876
AN - SCOPUS:84893616661
SN - 1386-1425
VL - 124
SP - 383
EP - 388
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -