Related Experiment Video
Updated: Jan 24, 2026

Author Spotlight: Advancing Bioimaging and Therapy with Functional Nanomaterials
Published on: September 13, 2024
Red-emitting phosphors APF6:Mn4+ (A = Cs+, Rb+, K+): synthesis, luminescence properties and application in
Yu Chen1, Zhaofeng Yang1, Qin Wang2
1Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials, School of Chemistry & Environment, Yunnan University, Kunming, 650500, P. R. China. wangzhengliang@foxmail.com.
Abstract:
A series of APF6:Mn4+ (A = Cs+, Rb+, K+) phosphors with single phases were obtained via a simple ion exchange method. These phosphors can exhibit red emission with a broad excitation band in the blue region. The optimized concentration of Mn4+ in APF6:Mn4+ was determined. The Racah parameters B and C of Mn4+ in APF6:Mn4+ were also calculated. The results indicate that Mn4+ in CsPF6:Mn4+ experiences the weakest crystal field among APF6:Mn4+. The phosphor CsPF6:Mn4+ prepared with the HPF6/K2MnF6 molar ratio of 10 : 1 has the strongest red emission and the highest external quantum efficiency of 50.4% among the samples. It has high thermal quenching resistance and its emission intensity at 160 °C is about 1.1 times higher than that at room temperature. This sample also can remarkably improve the color rendering index and decrease the colour rendering index of white light-emitting diodes (w-LEDs). Hence, CsPF6:Mn4+ could be used as a red-emitting phosphor for warm w-LEDs.
Related Concept Videos
Molecular and Ionic Solids
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
Structures of Solids
The Wave Nature of Light
Physical and Chemical Properties of Matter
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

