Tunable photoluminescence and energy transfer of YBO 3:Tb 3+, Eu 3+ for white light emitting diodes

Xianwen Zhang, Zhi Zhao, Xin Zhang, Archis Marathe, David B. Cordes, Brandon Weeks, Jharna Chaudhuri

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Rare-earth (Eu 3+, Tb 3+) ion co-doped YBO 3 phosphors with a morphology of uniform flower-like assembly are fabricated by a facile hydrothermal method without the use of surfactant, organic ligands, or further sintering treatment. Photoluminescence (PL) studies have demonstrated that under the excitation of 365 nm ultraviolet (UV) light, YBO 3:Tb 3+, Eu 3+ emits a white light, including three emissions: a blue band attributed to self-trapped excitons (STEs), a green band due to the Tb 3+ transition of 5D 4- 7F j (j = 6, 5, 4, and 3), and a red band due to the Eu 3+ transition of 5D 0- 7F j (j = 0, 1, 2, 3, and 4). Energy transfers from host YBO 3 to Tb 3+, and Eu 3+ and Tb 3+ to Eu 3+, as well as tunable emission by varying the relative doping ratios are demonstrated. The combination of blue emission from STEs with green and red emissions from activators provides a novel and efficient technique to make white light emitting diodes (WLEDs).

Original languageEnglish
Pages (from-to)7202-7207
Number of pages6
JournalJournal of Materials Chemistry C
Volume1
Issue number43
DOIs
StatePublished - Nov 21 2013

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