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Abstract
The luminescent properties of Ca2Nb2O7 matrix and Ca2Nb2O7: Pr3+ were studied in this work. In addition to the emission band from NbO6 octahedra, the orange-red emission aroused by oxygen interstitial defects was observed in Ca2Nb2O7. When Pr3+ was introduced, both of the matrix emission and the characteristic Pr3+ luminescence could appear simultaneously under suitable excitation wavelength. By further adjusting the doping concentration, color manipulation from blue-green to pink and red could be realized in Ca2Nb2O7: Pr3+. In particular, a warm white light could be achieved when doping 0.1% Pr3+. Based on the luminescent results, the underlying mechanisms were discussed and proposed. The color manipulation results suggest that Ca2Nb2O7: Pr3+ is promising for various fields related to lighting, displaying, and imaging.
Highlights
Materials, energy, and information are considered to be three pillars of the twenty-first century
Color manipulation can be readily obtained by combining inorganic materials with various emissions.[7,8]
Providing dopants with other emissions be introduced in Ca2Nb2O7, color manipulation is supposed to be obtained
Summary
Energy, and information are considered to be three pillars of the twenty-first century. Perovskite, niobite, pyrochlore, and lamellar niobate.[9,10] Because of their good physical and chemical properties, niobates could be applied in photocatalysis, solar cells, optical waveguide, optical information storage, and some other special fields.[11] The niobates possess a wide charge transfer band in ultraviolet (UV) region It means that niobates can transfer energy to the activators through the non-radiative processes, suggesting niobates could act as suitable luminescent matrices.[12] As one of the typical niobates for luminescent materials, Ca2Nb2O7 possesses the forbidden band width of 4.3 eV.[13] Ca2Nb2O7 itself could emit blue luminescence when excited by UV light.[14] Providing dopants with other emissions be introduced in Ca2Nb2O7, color manipulation is supposed to be obtained. A new orange-red emission related to the oxygen interstitial defects in Ca2Nb2O7 was first observed
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