Aliovalent M Site Substitutions of [PO4]3− and [HfO4]4− for [AlO4]5− and [GaO4]5− in the Sr3MO4F-type Anti-Perovskite Oxyfluoride. (17th January 2019)

• Record Type: Journal Article
• Authors: Keil, Sean T.; Chhoeun, Justin; Avdeev, Maxim; Sullivan, Eirin
• Is Part Of: ECS journal of solid state science and technology. Volume 8:Number 1(2019)
• Page Start: R1
• Page End: R8
• Publication Date: 2019-01-17
• Subjects: Luminescence -- Luminescence -- Solid-State Topics: General; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2.0031901jss
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : Rare earth-free phosphor materials have been synthesized via aliovalent doping of [PO4 ] 3− and [HfO4 ] 4− for [AlO4 ] 5− and [GaO4 ] 5− in the Sr3 M O4 F host lattice (space group I 4/ mcm ). High temperature synthesis was used to synthesize the novel products Sr2.5- x Ba0.5 Al1- x P x O4 F (0.05 ≤ x ≤ 0.15), Sr2.5- x Ba0.5 Ga1- x P x O4 F (0.05 ≤ x ≤ 0.15) and S r 2.5 − x 2 B a 0.5 A l 1 − x H f x O 4 F (0.025 ≤ x ≤ 0.075). The structures of these oxyfluorides were analyzed via powder X-ray diffraction (PXRD) and neutron powder diffraction (NPD), and their photoluminescent properties were analyzed through spectrofluorimetry before and after being treated under reducing conditions. Optimal doping was found at a concentration of x = 0.10 for Sr2.5- x Ba0.5 Al1- x P x O4 F ( a = 6.8762(4) Å; c = 11.1273(6) Å) resulting in a maximum emission at 454 nm when excited at 214 nm and x = 0.05 for the Ga analog ( a = 6.87591(7) Å; c = 11.3722(2) Å) corresponding to an emission centered around 529 nm from excitation with 227 nm. When doping with Hf 4+ the optimal concentration for S r 2.5 − x 2 B a 0.5 A l 1 − x H f x O 4 F was x = 0.025 ( a = 6.8607(1) Å; c = 11.1682(3) Å), resulting in a broad emission between 410–600 nm when excited at 251 nm.