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A General Ammonium Salt Assisted Synthesis Strategy for Cr 3+ ‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions
Author(s) -
He Fanquan,
Song Enhai,
Zhou Yayun,
Ming Hong,
Chen Zitao,
Wu Jiachang,
Shao Peishan,
Yang Xianfeng,
Xia Zhiguo,
Zhang Qinyuan
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202103743
Subject(s) - full width at half maximum , materials science , doping , quantum efficiency , near infrared spectroscopy , energy conversion efficiency , diode , optoelectronics , phosphor , salt (chemistry) , infrared , optics , organic chemistry , chemistry , physics
The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and emerging applications. Herein, a series of NIR emission hexafluorides A 2 BMF 6 :Cr 3+ (A = Na, K, Rb, Cs; B = Li, Na, K, Cs; M = Al, Ga, Sc, In) peaking at ≈733–801 nm with a full width at half maximum (FWHM) of ≈98–115 nm are synthesized by a general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation of the trivalent metal sources, the Cr 3+ can be more efficiently doped into the A 2 BMF 6 and simultaneously prevent the generation of the competitive phase. Particularly, Na 3 ScF 6 :Cr 3+ (λ em = 774 nm, FWHM ≈ 108 nm) with optimal Cr 3+ ‐doping concentration of 35.96% shows a high internal quantum efficiency of 91.5% and an external quantum efficiency of ≈40.82%. A lighting emitting diode (LED) device with a NIR output power of ≈291.05 mW at 100 mA driven current and high photoelectric conversion efficiency of 20.94% is fabricated. The general synthesis strategy opens up new avenues for the exploration of Cr 3+ ‐doped high efficiency phosphors, and the as‐obtained record NIR output power demonstrates for NIR LED lighting sources applications.