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Color‐Tunable Luminescence of YNbO 4 :Ln 3+ (Ln 3+ = Dy 3+ and/or Eu 3+ ) Nanocrystalline Phosphors Prepared by a Sol–Gel Process
Author(s) -
Lü Ying,
Chen Chen,
Li Shuailong,
Liu Xiaoming,
Yan Liushui,
Dai Yuhua,
Zhang Aiqin,
Xie Yu,
Tang Xinghua
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500699
Subject(s) - phosphor , cathodoluminescence , luminescence , analytical chemistry (journal) , chemistry , nanocrystalline material , ion , transmission electron microscopy , doping , materials science , crystallography , optoelectronics , nanotechnology , organic chemistry , chromatography
A series of YNbO 4 :Ln 3+ (Ln 3+ = Dy 3+ and/or Eu 3+ ) phosphors have been synthesized by a Pechini‐type sol–gel method. X‐ray diffraction, field‐emission scanning electron microscopy, and transmission electron microscopy were utilized to characterize the prepared phosphors. The pure phase of YNbO 4 was obtained after annealing at 1000 °C. The morphologies of the YNbO 4 :Ln 3+ (Ln 3+ = Dy 3+ and/or Eu 3+ ) phosphors are approximately spherical grains with a diameter of around 40–60 nm. The luminescence properties of the YNbO 4 :Ln 3+ (Ln 3+ = Dy 3+ and/or Eu 3+ ) phosphors were investigated by photo‐ and cathodoluminescence methods. Under the excitation of UV light and a low‐voltage electron beam, the YNbO 4 :Ln 3+ (Ln 3+ = Dy 3+ and/or Eu 3+ ) phosphors obtained show characteristic blue wide‐band emission from the NbO 4 group, whitish light emission from Dy 3+ , and red emission from Eu 3+ . Energy is transferred from the YNbO 4 host lattice to the Dy 3+ and Eu 3+ ions. Single‐phase white‐light‐emision was observed in YNbO 4 :Dy 3+ phosphors under the excitation of UV light and a low‐voltage electron beam. The color rendering index of the YNbO 4 :Dy 3+ phosphor can be further improved by co‐doping YNbO 4 :Dy 3+ with the Eu 3+ ion. The emission color of the YNbO 4 :Dy 3+ ,Eu 3+ phosphors can be simply tuned by changing the relative ratio of the Dy 3+ /Eu 3+ ions. The prepared YNbO 4 :Dy 3+ and YNbO 4 :Dy 3+ ,Eu 3+ phosphors have potential applications in UV white‐light‐emitting diodes and other optoelectronics display devices.