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Rare‐earth‐free Li 5 La 3 Ta 2 O 12 :Mn 4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties
Author(s) -
Cao Renping,
Lv Xinyan,
Ran Yaqin,
Xu Longxiang,
Chen Ting,
Guo Siling,
Ao Hui,
Yu Xiaoguang
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16447
Subject(s) - phosphor , photoluminescence , luminescence , quenching (fluorescence) , analytical chemistry (journal) , ion , octahedron , materials science , solid solution , chemistry , crystal structure , crystallography , optoelectronics , fluorescence , optics , physics , organic chemistry , chromatography , metallurgy
Li 5 La 3 Ta 2 O 12 :Mn 4+ (LLTO:Mn 4+ ) phosphors are prepared in air via high‐temperature solid‐state method and investigated for their crystal structures and luminescence properties. LLTO:Mn 4+ phosphor under excitation at 314 nm shows deep‐red emission peaking at 714 nm due to the 2 E→ 4 A 2 transition of Mn 4+ ion. The excitation bands in the range 220 ‐ 570 nm are attributed to the Mn 4+ ‐ O 2‐ charge‐transfer band and the 4 A 2g → 4 T 1g , 2 T 2g , and 4 T 2g transitions of Mn 4+ , respectively. The optimal Mn 4+ ion concentration is ~0.4 mol%. The concentration quenching mechanism in LLTO:Mn 4+ phosphor is electric dipole‐dipole interaction. The luminous mechanism and temperature quenching phenomenon are explained by the Tanabe‐Sugano energy level diagram and the configurational coordinate diagram of Mn 4+ in the octahedron, respectively. The experimental results indicate that LLTO:Mn 4+ phosphor has a potential application prospect as candidate of deep‐red component in light‐emitting diode (LED) lighting.