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Origin and Quenching of Novel ultraviolet and blue emission in NdGaO3: Concept of Super-Hydrogenic Dopants
- Source :
- Scientific reports, vol 6, iss 1, Ghosh, S; Saha, S; Liu, Z; Motapothula, M; Patra, A; Yakovlev, N; et al.(2016). Origin and Quenching of Novel ultraviolet and blue emission in NdGaO3: Concept of Super-Hydrogenic Dopants. Scientific Reports, 6. doi: 10.1038/srep36352. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/8jw1c9xt, Scientific Reports
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- In this study we report the existence of novel ultraviolet (UV) and blue emission in rare-earth based perovskite NdGaO3 (NGO) and the systematic quench of the NGO photoluminescence (PL) by Ce doping. Study of room temperature PL was performed in both single-crystal and polycrystalline NGO (substrates and pellets) respectively. Several NGO pellets were prepared with varying Ce concentration and their room temperature PL was studied using 325 nm laser. It was found that the PL intensity shows a systematic quench with increasing Ce concentration. XPS measurements indicated that nearly 50% of Ce atoms are in the 4+ state. The PL quench was attributed to the novel concept of super hydrogenic dopant (SHD)”, where each Ce4+ ion contributes an electron which forms a super hydrogenic atom with an enhanced Bohr radius, due to the large dielectric constant of the host. Based on the critical Ce concentration for complete quenching this SHD radius was estimated to be within a range of 0.85 nm and 1.15 nm whereas the predicted theoretical value of SHD radius for NdGaO3 is ~1.01 nm.
- Subjects :
- Quenching
Multidisciplinary
Photoluminescence
Materials science
Dopant
Doping
Analytical chemistry
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Article
Ion
Other Physical Sciences
X-ray photoelectron spectroscopy
0103 physical sciences
Biochemistry and Cell Biology
010306 general physics
0210 nano-technology
Bohr radius
Perovskite (structure)
Subjects
Details
- ISSN :
- 20452322
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....388dc0668249a2b39134724b52358bd6