title: Visible upconversion in Er3+/Yb3+co-doped LaAlO3phosphors.
abstract: The Er3+doped and Er3+/Yb3+co-doped LaAlO3phosphors have been synthesized by the combustion method and characterized their structural, morphological, elemental, vibrational and optical properties. The optical absorption and upconversion properties of the synthesized phosphors have been studied. Upon co-doping Yb3+ions into Er3+:LaAlO3, the blue, green and red upconversion emissions of Er3+ions have been enhanced about ~20, ~54 and ~22 times, under 978nm laser excitation. The observed upconversion emissions could be due to excited state absorption in Er3+:LaAlO3,whereas energy transfer is dominant mechanism in Er3+/Yb3+:LaAlO3phosphors. The tuning in the color emitted from the synthesized phosphors towards the green region has been found due to incorporation of the Yb3+ions. With increase in the pump power, the color emitted from the co-doped phosphor is not tuned significantly, showing its applicability in making the green display devices.
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143 701, Republic of Korea. Electronic address: vijayjiin2006@yahoo.com.
authors.forename: Vijay
authors.initials: V
authors.lastname: Singh
authors.affiliation: Department of Applied Physics, Indian School of Mines, Dhanbad, 826 004, Jharkhand, India.
authors.forename: V K
authors.initials: VK
authors.lastname: Rai
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143 701, Republic of Korea.
authors.forename: N
authors.initials: N
authors.lastname: Singh
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143 701, Republic of Korea.
authors.forename: M S
authors.initials: MS
authors.lastname: Pathak
authors.affiliation: Department of Physics, Yogi Vemana University, Kadapa 516 003, India.
authors.forename: M
authors.initials: M
authors.lastname: Rathaiah
authors.affiliation: Department of Physics, Yogi Vemana University, Kadapa 516 003, India.
authors.forename: V
authors.initials: V
authors.lastname: Venkatramu
authors.affiliation: Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410 820, Republic of Korea.
authors.forename: Rahul V
authors.initials: RV
authors.lastname: Patel
authors.affiliation: Materials Research Laboratory, Sharda University, Greater Noida 201 310, India.
authors.forename: Pramod K
authors.initials: PK
authors.lastname: Singh
authors.affiliation: Department of Physics, RTM Nagpur University, Nagpur 440 033, India.
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
keywords: Luminescence; Optical materials; Optical properties; Oxides; Phosphors