Open AccessEffect of sintering temperature on phase transformation and luminescence property of BaAl 2 Si 2 O 8 :Eu 2+ phosphor
Author(s) -
Ma Mingxing,
Wang Zhixin,
Liang Cun,
Zhao Cong,
Zhu Dachuan,
Han Tao
Publication year - 2018
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2018.5181
Subject(s) - phosphor , sintering , luminescence , materials science , phase (matter) , analytical chemistry (journal) , mineralogy , metallurgy , chemistry , optoelectronics , organic chemistry , chromatography
Sintered at different sintering temperatures, Eu 2+ doped BaAl 2 Si 2 O 8 phosphors were synthesised through one‐step calcination process of precursors prepared by chemical coprecipitation method. Thermal gravity‐differential thermal analysis was used to investigate the initial temperature of phase transition and the optimal sintering temperature of the sample synthesis. The X‐ray diffraction patterns confirmed that the sample calcined at 1200°C possessed a single hexagonal phase of BaAl 2 Si 2 O 8 . Although a little BaAl 2 Si 2 O 8 phase had been produced, BaAl 2 O 4 phase was dominant in the sample calcined at 1000°C. The morphology of the sample observed by scanning electron microscope showed smooth surfaces and nearly spherical shapes at higher sintering temperature. The emission spectrum of the sample calcined at 1000°C was separated into three Gaussians with the maximum at about 455, 501 and 540 nm, due to the 4f 7 →4f 6 5d transitions of Eu 2+ ions occupying the Ba site of BaAl 2 Si 2 O 8 and the Ba(1) and Ba(2) site of BaAl 2 O 4 , respectively. With the increase of sintering temperature, BaAl 2 Si 2 O 8 :Eu 2+ phosphor exhibited a blue broad emission band peaking at 455 nm with full width at half maximum about 90 nm under near‐ultraviolet excitation at ∼400 nm, and its emission intensity increased considerably due to the improved crystalline and homogeneous distribution of Eu 2+ ions.