In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 11, No. 31 ( 2023), p. 10634-10641
Abstract:
Compared with the well-studied energy transfer from Ce 3+ to Tb 3+ , the energy transfer from Eu 2+ to Tb 3+ has the advantage of high doping concentration of Tb 3+ , because Eu 2+ and Tb 3+ tend to occupy different lattice sites. Herein, the energy transfer from Eu 2+ to Tb 3+ is achieved in the Ca 8 SrGd(PO 4 ) 7 host for an efficient Tb 3+ doped green phosphor. The decrease in the lifetime of Eu 2+ emission with the increasing Tb 3+ concentration reveals the energy transfer from the Eu 2+ to Tb 3+ ions. Notably, the Tb 3+ emission of Ca 8 SrGd(PO 4 ) 7 :Eu 2+ ,Tb 3+ has the strongest intensity at the unity doping ratio of Tb 3+ , indicating a non-concentration quenching effect. The absorption efficiency in the near-ultraviolet region was increased from 6% to 75% after Eu 2+ was doped into Ca 8 SrTb(PO 4 ) 7 , and the emission was enhanced by approximately six times. Consequently, a high quantum efficiency (internal: 63% and external: 51%) was achieved in Ca 8 SrTb(PO 4 ) 7 :Eu 2+ . Finally, a near-ultraviolet chip excited white LED was fabricated by applying the as-prepared Ca 8 SrTb(PO 4 ) 7 :Eu 2+ as the green phosphor, with a high color rendering index of 93, and a low correlated color temperature of 3728 K. These results indicate that the presented phosphor has potential in lighting applications, providing a new perspective for developing efficient Tb 3+ activated phosphors through energy transfer and high doping concentration.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702245-6
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