Cs2MnF6 Red Phosphor with Ultrahigh Absorption Efficiency

Junfei Zhang; Lili Liu; Shengan He; Jiaqing Peng; Fu Du; Fengli Yang; Xinyu Ye

doi:10.1021/acs.inorgchem.9b02140

Cs₂MnF₆ Red Phosphor with Ultrahigh Absorption Efficiency

Inorg Chem. 2019 Nov 18;58(22):15207-15215. doi: 10.1021/acs.inorgchem.9b02140. Epub 2019 Oct 25.

Authors

Junfei Zhang^{1

2}, Lili Liu^{1

2}, Shengan He^{1

2}, Jiaqing Peng^{1

2}, Fu Du^{1

2}, Fengli Yang^{1

2}, Xinyu Ye^{1

2

3}

Affiliations

¹ School of Metallurgy and Chemistry Engineering , Jiangxi University of Science and Technology , Ganzhou 341000 , PR China.
² Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province , Ganzhou 341000 , PR China.
³ National Engineering Research Center for Ionic Rare Earth , Ganzhou 341000 , PR China.

PMID: 31652053
DOI: 10.1021/acs.inorgchem.9b02140

Abstract

To improve absorption efficiency (AE) and subsequently improve external quantum efficiency (EQE) remains one of the significant challenges for Mn⁴⁺-doped red-emitting fluoride phosphors. In this study, we propose to use Mn⁴⁺ as a part of matrix to enhance the AE of fluoride phosphors. Red-emission phosphors Cs₂MnF₆, Cs₂MnF₆:Sc³⁺, and Cs₂MnF₆:Si⁴⁺ were synthesized successfully by a coprecipitation method. The Rietveld refinement of X-ray diffraction reveals that this red phosphor exhibits a cubic structure in Fm3̅m space group. Owing to Mn⁴⁺ being a part of matrix, this kind of red phosphor possesses an extremely high AE, which can be promoted to 88%. The doping of Sc³⁺ and Si⁴⁺ ions into Cs₂MnF₆ can effectively increase the luminescence intensity to 253 and 232%, respectively, relative to that of Cs₂MnF₆. The relative emission intensity of Cs₂MnF₆:5%Si⁴⁺ red phosphor preserves about 115% when temperature rises to 175 °C. By employing Cs₂MnF₆:5%Si⁴⁺ as a red-emitting component, high-performance LED-1 with Ra = 86.2, R9 = 82.1 and CCT = 3297 K, and LED-2 with an ultrawide color gamut (NTSC value of 122.3% and rec. 2020 value of 91.3%) are obtained. This work may provide a new idea to explore a new type of fluoride phosphor with high EQE for high-performance white-light-emitting diodes.