Luminescence properties of Sr2MgB2O6：Tb3＋,Li＋ green-emitting phosphor

• Published in: Journal of rare earths Vol. 35; no. 3; pp. 211 - 216
• Main Author: 李震 郑淞生 杨星 罗斌 李帅 孙勇 程其进
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2017
• Subjects: green-emitting phosphor; luminescence; near ultraviolet excitation; rare earths; Sr2MgB2O6:Tb3+,Li; green-emitting phosphor; luminescence; Sr2MgB2O6:Tb3+,Li; near ultraviolet excitation; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(17)60901-3

A novel green phosphor,Sr2MgB2O6：Tb3＋,Li＋ for white light-emitting diodes was prepared by solid-state reactions,and its structure and luminescence properties were investigated.The excitation and emission spectra indicated that this as-prepared phosphor could be effectively excited by ultraviolet 368 nm,and exhibited bright green emission centered at 545 nm corresponding to the~5D_4→~7F_5 transition.9 mol.%of Tb~（3＋） was shown to be optimal.Good green emissions with the CIE chromaticity coordinates（0.262,0.583） could be achieved.Furthermore,the integrated emission intensity of Sr_2MgB_2O_6：0.09Tb~（3＋）,0.09Li~＋ phosphor decreased continuously to 72.1%at 300 ℃ with increasing temperature,and the activation energy of thermal quenching（E_a） was calculated to be0.175 eV,moreover,the quantum yield excited by 368 nm was measured as 11.1%.A green emission LED was made by coating Sr_2MgB_2O_6：0.09Tb~（3＋）,0.09Li~＋ phosphor on a NUV（365-370 nm） chip.Our results showed that Sr_2MgB_2O_6：Tb~（3＋）,Li~＋ is a kind of potential green-emitting phosphor and features good thermal stability.