High-temperature long persistent and photo-stimulated luminescence in Tb3+ doped gallate phosphor

Effects of the deep traps on the thermal‐stability property of CaAl2O4: Eu2+ phosphor

“…Electron trapping materials possess appropriate trap centers to capture charge carriers (electrons or holes), which can be subsequently released by optical or thermal activation, resulting in stimulated emissions from the emitting centers . CaAl 2 O 4 : Eu 2+ offers an opportunity to investigate the capture and release process of carriers, thanks to the high luminescent brightness, good chemical stability and environmental friendliness .…”

Warm white light emitting from single composition SrGa12O19:Dy3+ phosphors for AC‐LED

“…The gallate hosts improve the luminous efficiency by effectively absorbing the excitation light and delivering it to the luminescent center ions in our previous study on self-excited materials. 27 The luminescence intensity of the SGO host lattice is significantly weakened with the Dy 3+ ions concentration increases which indicated in Figure 3C,D. This may be ascribed to the energy transfer from the SGO to Dy 3+ ions.…”

“…The 260 nm peak is due to the band edge absorption of the SGO host, the 357, 391, and 461 nm peaks correspond to the 6 H 15/2 → 4 P 5/2 , 6 H 15/2 → 4 I 13/2 , and 6 H 15/2 → 4 I 15/2 transitions of Dy 3+ ions, respectively. The emission spectra at 260 nm is composed of four peaks due to the f → f transitions of Dy 3+ ions: a blue emission peak at 493 nm due to the 4 F 9/2 → 6 H 15/2 transition, a yellow one at 594 nm due to the 4 F 9/2 → 6 H 13/2 transition, a weak red one at 684 nm due to the 4 F 9/2 → 6 H 11/2 transition, and a weak deep red one at 750nm due to the 4 F 9/2 → 6 H 9/2 transition . Among all emission peaks, the yellow emission at 585 nm is the strongest, and indicates that the Dy 3+ sites deviate from the symmetrical center in SGO …”

“…The emission spectra at 260 nm is composed of four peaks due to the f → f transitions of Dy 3+ ions: a blue emission peak at 493 nm due to the 4 F 9/2 → 6 H 15/2 transition, a yellow one at 594 nm due to the 4 F 9/2 → 6 H 13/2 transition, a weak red one at 684 nm due to the 4 F 9/2 → 6 H 11/2 transition, and a weak deep red one at 750nm due to the 4 F 9/2 → 6 H 9/2 transition. 24,27,33 Among all emission peaks, the yellow emission at 585 nm is the strongest, and indicates that the Dy 3+ sites deviate from the symmetrical center in SGO. 25 (1) Figure 3C presents the PL spectra of the SGO: xDy 3+ (x = 0.005, 0.01, 0.02, 0.03, 0.04, and 0.05) phosphors, under 260 nm excitation.…”

“…[24][25][26] On the one hand, gallate is a wellknown self-excited LPP host material that is rich in defects and favors long persistent luminescence. [27][28][29] In this work, we design and synthesize a novel warm white-emitting LPP SGO: Dy 3+ , where the SrGa 12 O 19 host is a self-excited LPP, and Dy 3+ does not occupy the inversion centers. The crystal structure, the energy transfer process from SGO to Dy 3+ emission centers, the luminescence properties, anti-flicker properties, thermoluminescence properties, and the decay time are investigated.…”