Hidden Structural Evolution and Bond Valence Control in Near-Infrared Phosphors for Light-Emitting Diodes

被引：151

作者：

Fang, Mu-Huai ^{[1
]}

Chen, Kuan-Chun ^{[1
]}

Majewska, Natalia ^{[2
]}

Lesniewski, Tadeusz ^{[2
]}

Mahlik, Sebastian ^{[2
]}

Leniec, Grzegorz ^{[3
]}

Kaczmarek, Slawomir M. ^{[3
]}

Yang, Chia-Wei ^{[4
]}

Lu, Kuang-Mao ^{[4
]}

Sheu, Hwo-Shuenn ^{[5
]}

Liu, Ru-Shi ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[2] Gdansk Univ, Inst Expt Phys, Fac Math Phys & Informat, PL-80308 Gdansk, Poland

[3] West Pomeranian Univ Technol, Inst Phys, Dept Mech Engn & Mechatron, PL-70311 Szczecin, Poland

[4] Everlight Elect Co Ltd, New Taipei 238, Taiwan

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

ACS ENERGY LETTERS | 2021年 / 6卷 / 01期

关键词：

22;

D O I：

10.1021/acsenergylett.0c02373

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We aim to conduct a complete study on the unexpected structure evolution behavior in Cr3+-doped phosphors. A series of Ga2-xScxO3:Cr3+ phosphors are successfully synthesized and confirmed through structural studies, while the lattice parameters change unexpectedly. The unique partial substitution (similar to 87%) of Sc3+ in the octahedral site is demonstrated via Rietveld refinement. Therefore, the bond valence sum calculation explains the reason for this particular Sc3+ concentration. The photoluminescent bandwidth and electron-lattice coupling energy initially increase and then decrease, implying an inhomogeneous broadening effect. Time-resolved spectra and electron paramagnetic resonance are utilized to further examine the subtle change in the microstructures and the second coordination sphere effect of Cr3+center dot Ga1.594Sc0.4O3:0.006Cr(3+) exhibits high internal quantum efficiency (99%) and high phosphor-converted light-emitting diode output power (66.09 mW), demonstrating its capability as an outstanding infrared phosphor. This work will motivate further research on unexpected partial substitution during the solid solution process.

引用

页码：109 / 114

页数：6

共 22 条

[1] Broadband Near-Infrared Emitting Ca2LuScGa2Ge2O12:Cr3+ Phosphors: Luminescence Properties and Application in Light-Emitting Diodes [J].