title: Synthesis, persistent luminescence, and thermoluminescence properties of yellow Sr3SiO5:Eu2+,RE3+ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and orange-red Sr(3-x)Ba(x)SiO5:Eu2+, Dy3+ phosphor.
abstract: Sunlight-excitable orange or red persistent oxide phosphors with excellent performance are still in great need. Herein, an intense orange-red Sr3-xBaxSiO5:Eu(2+),Dy(3+) persistent luminescence phosphor was successfully developed by a two-step design strategy. The XRD patterns, photoluminescence excitation and emission spectra, and the thermoluminescence spectra were investigated in detail. By adding non-equivalent trivalent rare earth co-dopants to introduce foreign trapping centers, the persistent luminescence performance of Eu(2+) in Sr3SiO5 was significantly modified. The yellow persistent emission intensity of Eu(2+) was greatly enhanced by a factor of 4.5 in Sr3SiO5:Eu(2+),Nd(3+) compared with the previously reported Sr3SiO5:Eu(2+), Dy(3+). Furthermore, Sr ions were replaced with equivalent Ba to give Sr3-xBaxSiO5 :Eu(2+),Dy(3+) phosphor, which shows yellow-to-orange-red tunable persistent emissions from λ=570 to 591 nm as x is increased from 0 to 0.6. Additionally, the persistent emission intensity of Eu(2+) is significantly improved by a factor of 2.7 in Sr3-xBaxSiO5 :Eu(2+),Dy(3+) (x=0.2) compared with Sr3SiO5 :Eu(2+),Dy(3+). A possible mechanism for enhanced and tunable persistent luminescence behavior of Eu(2+) in Sr3-xBaxSiO5:Eu(2+),RE(3+) (RE=rare earth) is also proposed and discussed.
authors.affiliation: Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275 (P.R. China), Fax: (+86) 20-84111038.
authors.forename: Ye
authors.initials: Y
authors.lastname: Li
authors.forename: Baohong
authors.initials: B
authors.lastname: Li
authors.forename: Chenchen
authors.initials: C
authors.lastname: Ni
authors.forename: Shuxia
authors.initials: S
authors.lastname: Yuan
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Tang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Su
mesh_terms: D005063:Europium / Q000737:chemistry*; D008163:Luminescent Measurements; D008674:Metals, Rare Earth / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D008674:Metals, Rare Earth; D017640:Silicates; D005063:Europium; D013324:Strontium
keywords: persistent luminescence; rare earths; silicates; thermoluminescence