Structure and Photoluminescence of Eu²⁺Doped Sr₂Al₂SiO₇Cyan-Green Emitting Phosphors

Abstract

Eu 2+ doped Sr 2 Al 2 SiO 7 cyan-green emitting phosphors have been synthesized with solid-state reaction method. With Rietveld refinement technique, Sr 2 Al 2 SiO 7 equivalent sites and atomic positions were acquired. The Sr 2 Al 2 SiO 7 :Eu 2+ photoluminescence at room and high temperature were investigated. This phosphor shows the Eu 2+ broad band excitation and emission spectra corresponding to Eu 2+ transitions between the 4f 7 ground state and the lower 4f 6 5d 1 crystal splitting states. The luminescent properties as a function of Eu 2+ concentration were investigated. The mechanism of dipole-dipole interaction dominates the nonradiative energy transfer between the Eu 2+ luminescent centers and causes the concentration quenching of this phosphor. The radiation re-absorption is proposed to be the mechanism for the emission red shift. The emission band shows slight blue shift with increased temperature. Sr 2 Al 2 SiO 7 :Eu 2+ is a kind of promising blue to cyan emitting phosphor.

Emission properties and temperature dependence of Cu+ luminescence in the CaO–CaF2–P2O5 ternary glass system co-doped with CuO and SnO

“…In fact, phonon-assisted processes involving ion-ion interactions in Cu + -doped phosphate glasses are not uncommon [35]. Similar blue shifts have been also reported for other luminescent systems [36,37] likely connected to thermally-activated phonon-assisted processes.…”

CÔNG NGHỆ CHẾ TẠO VÀ TÍNH CHẤT QUANG CỦA VẬT LIỆU Sr2Al2SiO7 PHA TẠP EUROPIUM

“…Nhiều năm gần đây, vật liệu phát quang trên nền aluminate kiềm thổ pha tạp các nguyên tố đất hiếm như SrAl2O4: Eu 2+ , Dy 3+ ; CaAl2O4: Eu 2+ , Nd 3+ và BaAl2O4: Eu 2+ , Dy 3+ đã được chế tạo và nghiên cứu rộng rãi [1][2][3][4]. Gần đây, vật liệu lân quang dài trên nền silicate alumino kiềm thổ (Sr, Ca)2Al2SiO7 đã được các nhà khoa học quan tâm nghiên cứu [5][6][7][8][9][10][11][12]. Silicate alumino kiềm thổ có tính ổn định hóa học cao và khả năng chịu nước tốt hơn nhiều so với vật liệu phát quang trên nền sunfua và aluminate nên thích hợp làm mạng nền của vật liệu phát quang.…”

Energy Level Locations of Lanthanide Ions in Strontium-Aluminosilicate Phosphors

“…Email address: hovantuyen@gmail.com https//doi.org/ 10.25073/2588-1124/vnumap.4594 [1], steady crystalline structure [2]. In some recent studies, Eu 2+ -doped SAS materials have been synthesized to obtain green emission phosphor [3]; long persistent luminescence and thermoluminescence properties of Eu and Ln 3+ (Dy 3+ , Ce 3+ , Tm 3+ ) co-doped into SAS host materials have also reported [4][5][6][7][8]; Energy transfer between Ce 3+ and Dy 3+ , Eu 3+ ions as well as the concentration quenching of Ce 3+ in SAS materials have been studied [9][10][11]. Besides that, the fabrication method for SAS phosphors has been studied and reported in several papers [12,13] and some other studies have focused on the controllable photoluminescence or thermal stablility of the prepared materials [1,14].…”