Abstract
Eu3+-doped Gd2O2CN2 was firstly synthesized by a classical solid-state reaction of Li2CO3, Eu2O3 and GdF3 under NH3 gas flow in the presence of graphite at low firing temperature. Powder X-ray diffraction (XRD) analysis indicated that Gd2O2CN2: Eu3+ crystallizes in a trigonal-type structure with space group P-3m1. Gd2O2CN2: Eu3+ shows a sharp red emission band peaking at 626 nm under excitation at 300 nm at room temperature. PL spectra indicates that Eu3+ doped Gd2O2CN2 samples emit the typical emission peaks at 614 nm and 626 nm originated from the hypersensitive electric dipole transition (5D0→7F2) of Eu3+ ions. The optimized doping concentration of Eu3+ ions was found to be 7.5 at. %, and the critical transfer distance was calculated to be 10.907 A.
Highlights
Much attention has been paid on investigating red emitting phosphors owing to their potential applications in X-ray mammography [1], in display devices [2,3] and especially in white light emitting diodes (WLEDs) [4,5,6]
Eu2O2CN2 and Gd2O2CN2 have the same crystal structure based on a trigonal unit cell with the space group P-3m1 and the linear CN22- ions lay perpendicular to RE2O22+ (RE=Eu and Gd) layers [11]
The characteristic diffraction peaks of all samples can be ascribed to the trigonal structure of Gd2O2CN2 (PDF#49-1169) with the space group P-3m1
Summary
Much attention has been paid on investigating red emitting phosphors owing to their potential applications in X-ray mammography [1], in display devices [2,3] and especially in white light emitting diodes (WLEDs) [4,5,6]. Eu3+- doped luminescent materials as the main and outstanding red-emitting phosphors, such as Eu3+ doped Y2O3 [3], Y2O2S [7], R2(MoO4) (R=La, Y, Gd)[8] and NaEu(WO4)2[5], have been studied for decades due to the transition of 5D0-7FJ (J = 1-6) of Eu3+. These excellent red emitting phosphors can hardly fulfill the demands for novel high-performance materials. We propose here to further investigate the preparation and photoluminescence properties of pure micrometric Gd2O2CN2:Eu3+ phosphors. Luminescence properties and the concentration quenching characteristics were investigated in detail
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