TY - JOUR
T1 - Synthesis and photoluminescence properties of Β-sialon
T2 - Eu2+ (Si6-z Alz Oz N8-z: Eu2+)
AU - Xie, R. J.
AU - Hirosaki, N.
AU - Li, H. L.
AU - Li, Y. Q.
AU - Mitomo, M.
PY - 2007
Y1 - 2007
N2 - Divalent europium-activated Β -sialon (Si6-z Alz Oz N8-z, 0.1≤z≤2.0) phosphors with dopant concentration varying in the range of 0.02-1.5 mol % were synthesized by firing the powder mixture of α- Si3 N4, AlN, Al2 O3, and Eu2 O3 at 2000°C for 2 h under a nitrogen-gas pressure of 1.0 MPa. The phase purity, microstructure, luminescence spectra, and thermal quenching of the fired Β-sialon: Eu2+ phosphors were investigated. The samples with lower z values (z≤1.0) showed higher phase purity, finer and more uniform particle size, and higher emission. Green luminescence of Eu2+ (λem =528-550 nm) was achieved in Β -sialons upon near-ultraviolet (NUV) or blue-light excitations. Furthermore, the Β-sialon: Eu2+ phosphors had small thermal quenching, the emission intensity of which attained 84-87% of that measured at room temperature. The experimental data clearly indicates that Β-sialon: Eu2+ has great potentials as a down-conversion green phosphor for white light-emitting diodes (LEDs) utilizing NUV or blue LEDs as the primary light source.
AB - Divalent europium-activated Β -sialon (Si6-z Alz Oz N8-z, 0.1≤z≤2.0) phosphors with dopant concentration varying in the range of 0.02-1.5 mol % were synthesized by firing the powder mixture of α- Si3 N4, AlN, Al2 O3, and Eu2 O3 at 2000°C for 2 h under a nitrogen-gas pressure of 1.0 MPa. The phase purity, microstructure, luminescence spectra, and thermal quenching of the fired Β-sialon: Eu2+ phosphors were investigated. The samples with lower z values (z≤1.0) showed higher phase purity, finer and more uniform particle size, and higher emission. Green luminescence of Eu2+ (λem =528-550 nm) was achieved in Β -sialons upon near-ultraviolet (NUV) or blue-light excitations. Furthermore, the Β-sialon: Eu2+ phosphors had small thermal quenching, the emission intensity of which attained 84-87% of that measured at room temperature. The experimental data clearly indicates that Β-sialon: Eu2+ has great potentials as a down-conversion green phosphor for white light-emitting diodes (LEDs) utilizing NUV or blue LEDs as the primary light source.
UR - https://www.scopus.com/pages/publications/34548227002
U2 - 10.1149/1.2768289
DO - 10.1149/1.2768289
M3 - 文章
AN - SCOPUS:34548227002
SN - 0013-4651
VL - 154
SP - J314-J319
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 10
ER -
