Bright red luminescence from co-doped Dy3+/Eu3+: CaLa2ZnO5 phosphors for photonic applications

• Published in: Journal of alloys and compounds 2017-10, Vol.721, p.554-562
• Main Authors: Kumar, K. Naveen, Kim, Jong Su, Cho, Migyung, Shim, Jaesool, Gupta, Bipin Kumar, Kang, Misook
• Format: Article
• Language: English
• Subjects: Chemical synthesis; Dysprosium; Electron transitions; Emission analysis; Emissions; Energy transfer; Europium; Excitation spectra; Field emission microscopy; Fluorescence; Luminescence; Phosphors; Photoluminescence; Photonics; Red emission; Scanning electron microscopy; Solid state; Spectral emissivity; Thermal analysis; Zinc oxide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.05.322

A bright novel red emission was obtained from Eu3+: CaLa2ZnO5 (CLZO) Phosphors under visible excitation. We have successfully synthesized Eu3+: CLZO Phosphors by the solid state reaction method. The phase formation and surface morphological studies were analyzed by X-ray diffraction and Field emission scanning electron microscopy respectively. Thermal analysis was done by TG/DTA. Photoluminescence spectral profiles reveal that the strong red emission has been noticed at 626 nm (5D0→7F2) from the Eu3+: CLZO Phosphors under the excitation of 467 nm. The emission and excitation spectral profiles were systematically analyzed and their bands were assigned with corresponding electronic transitions. Upon increasing the Eu3+ concentration, the photoluminescence performance has also been increased remarkably. The optimized concentration of the Eu3+ was noticed at 14 mol%. Upon co-doping with Dy3+ ions to Eu3+: CLZO Phosphors, the red emission pertaining to Eu3+ was appreciably enhanced through energy transfer form Dy3+ to Eu3+ ions. The energy transfer mechanism was substantiated by several fluorescent methods. The prominent red emission of the Dy3+/Eu3+: CLZO Phosphors under blue excitation which suggests that these phosphor materials could be promising candidates for red luminescent optical devices. [Display omitted] •Dazzling red emission is observed from Eu3+/Dy3+:CaLa2ZnO5 Phosphors.•Red emission of Eu3+ was significantly enhanced by co-doping with Dy3+.•Effective sensitization of Dy3+ ions has been elucidated.•The energy transfer path way was clearly demonstrated from Dy3+ to Eu3+.•CIE coordinates are very close to National Television Standard Committee (NTSC).