Thermally Stable and Deep Red Luminescence of Sr1-xBax[Mg2Al2N4]:Eu2+ (x=0-1) Phosphors for Solid State and Agricultural Lighting Applications

被引:44
|
作者
Leano, Julius L., Jr. [2 ,5 ,6 ,7 ]
Mariano, Carl Osby M. [1 ]
Huang, Wen-Tse [2 ]
Mahlik, Sebastian [8 ]
Lesniewski, Tadeusz [8 ]
Grinberg, Marek [8 ]
Sheu, Hwo-Shuenn [9 ]
Hu, Shu-Fen [1 ]
Liu, Ru-Shi [2 ,3 ,4 ]
机构
[1] Natl Taiwan Normal Univ, Dept Phys, Taipei 11677, Taiwan
[2] Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan
[3] Natl Taipei Univ Technol, Dept Mech Engn, Taipei 10608, Taiwan
[4] Natl Taipei Univ Technol, Grad Inst Mfg Technol, Taipei 10608, Taiwan
[5] Acad Sinica, Nanosci & Technol Program, Taiwan Int Grad Program, Taipei 10617, Taiwan
[6] Natl Taiwan Univ, Taipei 10617, Taiwan
[7] Philippine Text Res Inst, Dept Sci & Technol, Taguig City 1631, Philippines
[8] Gdansk Univ, Inst Expt Phys, Fac Math Phys & Informat, PL-80308 Gdansk, Poland
[9] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan
关键词
nitride phosphor; deep red; plant lighting; solid-state lighting; UCr4C4-type phosphor; NARROW-BAND EMISSION; EU2+; ENERGY; TRANSITION;
D O I
10.1021/acsami.0c07345
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The systematic substitution of Ba in the Sr site of Sr[Mg2Al2N4]:Eu2+ generates a deep-red-emitting phosphor with enhanced thermal luminescence properties. Gas pressure sintering (GPS) of all-nitride starting materials in Molybdenum (Mo) crucibles yields pure-phase red-orange-colored phosphors. Peaks in the synchrotron X-ray diffraction (SXRD) data show a systematic shift toward smaller angles due to the introduction of the larger Ba cation in the same crystal structure. The photoluminescence property reveals that Ba substitution shifts the original emission wavelength of Sr[Mg2Al2N4]:Eu2+ (625 nm) toward similar to 690 nm for Ba[Mg2Al2N4]:Eu2+. Thermal stability measurement of Sr1-xBax[Mg2Al2N4] indicates a systematic increase in stability from x = 0 to x = 1. X-ray absorption near-edge spectroscopy (XANES) results demonstrate the coexistence of Eu2+ and Eu3+. The red-shift and the enhanced thermal stability reveals that the distance of the emitting 5d level to the conduction band of Ba[Mg2Al2N4]:Eu2+ is large. The ionic size mismatch of Eu occupying a Ba site reduces the symmetry, thereby further splitting the degenerate emitting 5d level and lowering the energy of the emitting center. The development of deep-red phosphors emitting at 670-690 nm (x = 0.8-1.0) offers possible candidates for plant lighting applications.
引用
收藏
页码:23165 / 23171
页数:7
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