Origin and Quenching of Novel ultraviolet and blue emission in NdGaO3: Concept of Super-Hydrogenic Dopants.
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.
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Siddhartha
S
Ghosh
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Department of Physics, National University of Singapore, 117542, Singapore.
Surajit
S
Saha
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Department of Physics, National University of Singapore, 117542, Singapore.|School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
Zhiqi
Z
Liu
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
M
M
Motapothula
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Abhijeet
A
Patra
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), Innovis 08-03, 2 Fusionopolisway, 138634, Singapore.
Nikolai
N
Yakovlev
Department of Materials Science and Engineering, UC Berkeley, 210 Hearst Ave, Berkeley, CA, 94720, United States.
Yao
Y
Cai
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Saurav
S
Prakash
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), Innovis 08-03, 2 Fusionopolisway, 138634, Singapore.|Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
Xiao Hu
XH
Huang
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Chuan Beng
CB
Tay
Divsion of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
Chun Xiao
CX
Cong
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), Innovis 08-03, 2 Fusionopolisway, 138634, Singapore.
Thirumaleshwara
T
Bhatt
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), Innovis 08-03, 2 Fusionopolisway, 138634, Singapore.
Surani B
SB
Dolmanan
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
Jianqiang
J
Chen
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Weiming
W
Lü
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.
Zhen
Z
Huang
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), Innovis 08-03, 2 Fusionopolisway, 138634, Singapore.
Sudhiranjan
S
Tripathy
Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
Soo Jin
SJ
Chua
Divsion of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
Ting
T
Yu
Department of Materials Science and Engineering, UC Berkeley, 210 Hearst Ave, Berkeley, CA, 94720, United States.
Mark
M
Asta
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Department of Physics, National University of Singapore, 117542, Singapore.
A
A
Ariando
NUSNNI-Nanocore, National University of Singapore, 117411, Singapore.|Department of Physics, National University of Singapore, 117542, Singapore.|Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
T
T
Venkatesan