title: Preparation, characterization and photoluminescence properties of BaB2O4: Eu3+ red phosphor.
abstract: A new red emitting BaB2O4: Eu3+ phosphor was synthesized by solid-state reaction method. X-ray powder diffraction (XRD) analysis confirmed the monoclinic formation of BaB2O4. Field-emission scanning electron-microscopy (FE-SEM) observation indicated that the microstructure of the phosphor consisted of irregular grains with heavy agglomerate phenomena. Upon excitation with 394 nm light, the BaB2O4: Eu3+ phosphor shows bright red emissions with the highest photoluminescence (PL) intensity at 611 nm due to 5D0→7F2 transitions of Eu3+ ions. The CIE chromaticity coordinates are calculated from the emission spectrum to be x=0.64, y=0.35. The effects of the Eu3+ concentration on the PL were investigated. The results showed that the optimum concentration of Eu3+ in BaB2O4 host is 6 mol% and the dipole-dipole interaction plays the major role in the mechanism of concentration quenching of Eu3+ in BaB2O4: Eu3+ phosphor. The effect of charge compensation on the emission intensity was also studied. The charge compensations of Li+, Na+ and K+ anions all increased the luminescent intensity of BaB2O4: Eu3+. K+ anion gave the best improvement to enhance the intensity of the emission, indicating K+ is the optimal charge compensator. All properties show that this phosphor could serve as a potential candidate for application as a red phosphor for NUV chip LED.
authors.affiliation: Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.forename: Xiang-De
authors.initials: XD
authors.lastname: Wang
authors.forename: Zhan-Chao
authors.initials: ZC
authors.lastname: Wu
authors.forename: Shao-Ping
authors.initials: SP
authors.lastname: Kuang
mesh_terms: D017609:Barium Compounds / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis*; D008163:Luminescent Measurements; D008855:Microscopy, Electron, Scanning; D010758:Phosphorus / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017609:Barium Compounds; D049408:Luminescent Agents; D010758:Phosphorus; D005063:Europium