Cationic substitution induced tuning of photoluminescence in Ba2.94-2xLaxNaxP4O13: 0.06Eu phosphors for WLEDs.
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| Title: | Cationic substitution induced tuning of photoluminescence in Ba2.94-2xLaxNaxP4O13: 0.06Eu phosphors for WLEDs. |
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| Authors: | Wu, Zhan-Chao1 (AUTHOR), Cui, Li-Li1 (AUTHOR), Zhang, Xue1 (AUTHOR), Zhang, Xing-Xing1 (AUTHOR), Liu, Jie1 (AUTHOR) qustliujie@qust.edu.cn, Ma, Li2 (AUTHOR), Wang, Xiao-Jun1,2 (AUTHOR) xwang@georgiasouthern.edu, Zhang, Ji-Lin3 (AUTHOR) |
| Source: | Journal of Alloys & Compounds. Sep2020, Vol. 835, pN.PAG-N.PAG. 1p. |
| Subjects: | Phosphors, Photoluminescence, Electron transitions |
| Abstract: | The cationic substitution of [La3+-Na+ for [Ba2+-Ba2+ pairs in the Eu2+ doped Ba 3 P 4 O 13 (BPO) phosphors is designed to investigate the effect on Eu valence state and photoluminescence properties. Energy dispersive spectroscopy (EDS) analysis demonstrates the successful incorporation of La3+ and Na+ into BPO, forming Ba 2.94-2 x La x Na x P 4 O 13 (BLNPO). Eu3+ ions doped in BLNPO host can only be partly reduced to Eu2+ state under a reducing atmosphere and the reduction mechanism is proposed. BLNPO: Eu exhibits a blue-green broad emission band derived from Eu2+ and a series of sharp emission lines from 570 to 720 nm assigned to the electron transition of 5 D 0 →7 F J (J = 0, 1, 2, 3, 4) of Eu3+. The emission colors of the BLNPO: Eu phosphors can be tuned from blue-green to white and eventually to orange via regulating [La3+-Na+ content. Through this strategy, color-tunable white light emission is successfully achieved and optimized in single-phase BLNPO host, which enables the BLNPO: Eu phosphors to be potential color-tunable phosphor candidates for WLEDs. Image 1 • Ba 2.94-2 x La x Na x P 4 O 13 : 0.06Eu phosphors are prepared by cationic pair substitution. • Eu3+ ions doping in BLNPO matrix are controllably reduced to Eu2+ ions. • The partial reduction is due to the changes of lattice and cation valence state. • The emission color can be tuned from blue-green to white and finally to orange. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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