Back to Search
Start Over
A highly-distorted octahedron with a C2vgroup symmetry inducing an ultra-intense zero phonon line in Mn4+-activated oxyfluoride Na2WO2F4
- Source :
- Journal of Materials Chemistry C. 5:10524-10532
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- Owing to the magnetic dipole nature, the zero phonon line (ZPL) of Mn4+:2E → 4A2 transition is weak unless Mn4+ is situated at a site deviating from the centrosymmetric nature. Herein, we report a brand-new oxyfluoride, Na2WO2F4:Mn4+(NWOF:Mn4+), which shows unprecedented intense red ZPL at ∼620 nm along with relatively weak vibronic transitions under blue light excitation. This peculiar spectral feature is demonstrated to be originated from the highly distorted octahedral coordination environment in the C2v group symmetry surrounding Mn4+. High-resolution spectroscopic studies at 10 K disclose the fine structured electronic/vibronic transitions of Mn4+:2E, 2T1 → 4A2 and the weak electron–phonon interaction (Huang–Rhys factor S < 1) on the Mn4+ emissive state. Benefiting from the intense ZPL, an ultra-high color rendering index with Ra = 92.7 and R9 = 90.0 is achieved in the w-LED using YAG:Ce3+and NWOF:Mn4+ as color converters, and a wide color gamut of 107.1% NTSC in the w-LED using CsPbBr3 quantum dots and NWOF:Mn4+ is obtained. Herein, we first demonstrate that Mn4+-activated oxyfluorides have great potential in w-LED lighting and display applications. Our study can also enlighten researchers to design highly distorted octahedral sites for Mn4+ doping to achieve an ultra-intense ZPL.
- Subjects :
- Materials science
Phonon
business.industry
Doping
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
0104 chemical sciences
Color rendering index
Octahedron
Quantum dot
Materials Chemistry
Optoelectronics
0210 nano-technology
business
Magnetic dipole
Excitation
Line (formation)
Subjects
Details
- ISSN :
- 20507534 and 20507526
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry C
- Accession number :
- edsair.doi...........9f495002c3d30901ec1aa522e09a11de