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SrHfO3:Cr3+ Perovskite Microcubes for Rare-Earth-Free NIR-I Light Emission.
- Source :
- Journal of Electronic Materials; Jan2024, Vol. 53 Issue 1, p280-287, 8p
- Publication Year :
- 2024
-
Abstract
- Near-infrared (NIR)-emitting phosphors are in high demand owing to their application in areas of high importance, such as security, night-surveillance, imaging, storage, and optoelectronics. However, to achieve high success in these applications, wide broadband NIR emissions are needed and, in that context, the crystalline field of the host matrix plays a very important role. In this work, we have achieved a broad NIR emission in the range of 700–1000 nm in hydrothermally synthesized SrHfO<subscript>3</subscript>:Cr<superscript>3+</superscript> (SHOC). SHO assumes a microcrystalline cube morphology, and chromium doping make it more and more symmetric, and the particle size increases with doping. Broadband NIR emissions have been ascribed to the stabilization of Cr<superscript>3+</superscript> in a strong crystalline field of HfO<subscript>6</subscript> octahedra. X-ray photoelectron spectroscopy supported this by confirming the formation of oxygen vacancies in all the samples. The shorter lifetime (~13–44 µs) is attributed to chromium ions situated in close vicinity to oxygen vacancies at distance X, whereas the longer-lived (~56–127 µs) originate from chromium ions situated at a long distance from oxygen vacancies at distance Y, and Y is greater than X. Positron annihilation lifetime spectroscopy suggested an increase in defect concentration with doping, which causes concentration quenching beyond 2.0 mol% endowed by multipolar interactions. This work culminates the very important role of defects, local site, and doping on efficient NIR light emissions from a perovskite lattice. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03615235
- Volume :
- 53
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Electronic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 174014776
- Full Text :
- https://doi.org/10.1007/s11664-023-10775-2