Trade-off Lattice Site Occupancy Engineering Strategy for Near-Infrared Phosphors with Ultrabroad and Tunable Emission

被引：78

作者：

Lang, Tianchun ^{[1
]}

Cai, Mingsheng ^{[2
]}

Fang, Shuangqiang ^{[3
]}

Han, Tao ^{[1
]}

He, Shuangshuang ^{[1
]}

Wang, Qunyi ^{[2
]}

Ge, Guanghui ^{[2
]}

Wang, Jun ^{[1
]}

Guo, Chaozhong ^{[1
]}

Peng, Lingling ^{[1
]}

Cao, Shixiu ^{[1
]}

Liu, Bitao ^{[1
]}

Korepanov, Vladimir, I ^{[2
]}

Yakovlev, Alexey N. ^{[4
]}

Qiu, Jianbei ^{[5
]}

机构：

[1] Chongqing Univ Arts & Sci, Res Inst New Mat Technol, Chongqing Key Lab Mat Surface & Interface Sci, Chongqing 402160, Peoples R China

[2] Natl Res Tomsk Polytech Univ, Sch Adv Mfg Technol, Tomsk 634050, Russia

[3] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China

[4] TF Gorbachev Kuzbass State Tech Univ, Inst Chem & Oil Gas Technol, Kemerovo 650000, Russia

[5] Kunming Univ Sci & Technol, Coll Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

来源：

ADVANCED OPTICAL MATERIALS | 2022年 / 10卷 / 02期

基金：

中国国家自然科学基金;

关键词：

lattice site occupancy; NIR phosphor; superexchange coupling; trade-off engineering strategy; ultrabroad emission; LUMINESCENCE PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; STRUCTURAL RIGIDITY; BOND VALENCE; DISTORTION; SPECTRA; EPR;

D O I：

10.1002/adom.202101633

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Broadband near-infrared (NIR) luminescent materials have received notable attention due to their distinct photophysical properties for designing NIR light-emitting diodes (NIR LEDs). Here, a series of Ca3-xLuxGa2+xGe3-xO12:Cr3+ (CLGGG:Cr3+) (x = 0-1) NIR-emitting garnet phosphors with an emission range of 660-1200 nm are successfully developed and their lattice parameters are structurally analyzed. Upon 460 nm blue light excitation, the NIR phosphors exhibit both a substantial spectral broadening (FWHM: 129 -> 267 nm) and a redshift of 37 nm (766 -> 803 nm) with cosubstitution of [Lu3+-Ga3+] pairs for [Ca2+-Ge4+] sites. Furthermore, their luminescence thermal stability is substantially improved, maintaining approximate to 90% of the original photoluminescence intensity at 150 degrees C, owing to shrinkage of the second coordination sphere and rigid lattice, which are strongly associated with Cr3+ trade-off occupancy and local structure evolutions. The relation between the trade-off site occupation of Cr3+ in GaO6/CaO8 polyhedrons and the NIR emission is also clarified by evaluating the decay and electron paramagnetic resonance behavior of Cr3+ at different sites. The broadband NIR phosphors investigated here can serve as auspicious luminescent converters for phosphor-converted NIR LEDs and can provide an inspiring platform for future studies.

引用

页数：12

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