Nanothick aluminate long-afterglow phosphors using inherited hydrothermal deriving

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Title:	Nanothick aluminate long-afterglow phosphors using inherited hydrothermal deriving
Authors:	Wu, CY (Wu, Chen-Yu) Lei, CM (Lei, Chien-Ming) Wu, R (Wu, Rudder) Takei, T (Takei, Toshiaki) Chou, CC (Chou, Chau-Chang) Wang, SH (Wang, Shing-Hoa) Chang, HY (Chang, Horng-Yi)
Contributors:	化學工程與材料工程學系暨奈米材料研究所
Keywords:	STRONTIUM ALUMINATE PERSISTENT LUMINESCENCE SRAL2O4EU2+,DY3+ NANOSHEETS ENERGY-TRANSFER DY3+ PHOSPHORS SRAL2O4 EU2+ MECHANISM B2O3 NANOPARTICLES
Date:	2019-02
Issue Date:	2019-06-25 15:15:35 (UTC+8)
Abstract:	A novel strategy of the inherited hydrothermal method was used to prepare SrAl2O4: 0.01Eu(2+), 0.01Dy(3+) (SAO) without boron (ISAO) and boron-doping (BSAO) via NaAlO2 as an aluminum source and mineralizer at 200 degrees C for 6-24 h. The investigated optical properties was correlated to phase transformation and phosphor morphology. The main constituting phases of Al-2(OOH)(2) and SrCO3 transformed to monoclinic SrAl4O7 and mixed monoclinic/hexagonal SrAl2O4 then pure monoclinic SrAl2O4 during different hydrothermal period. The hydrothermally prepared samples exhibited flower-like morphology. The annealed plate phosphors with nanothick single crystals inherited from hydrothermal feature. The shift of photoluminescence (PL) peak wavelength corresponded to the phase transformation from SrAl4O7 to SrAl2O4 with hydrothermal time for ISAO and BSAO. The PL intensity increased with hydrothermal time due to achieving the pure SrAl2O4 phase with preferred orientation geometry and further enhanced by boron-doping. The afterglow of BSAO was significantly enhanced than ISAO, solid-state prepared MSAO and commercial SAO at the initial 100 s after excitation cut-off. The boron doped in the BSAO was scarcely on the grain surface as to small grain size. Thus, the afterglow enhancement should be attributed to the boron in the lattice inducing defect traps. Overall, the inherited hydrothermal and boron-doping derived nanothick SAOs with large surface preferred orientation enhanced the PL and afterglow properties.
Relation:	Journal of Luminescence, Volume 206, February 2019, Pages 593-602
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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