Studies of terbium bridge: Saturation phenomenon, significance of sensitizer and mechanisms of energy transfer, and luminescence quenching

Dawei Wen, Jianxin Shi, Mingmei Wu, Qiang Su

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    54 Citations (Scopus)

    Abstract

    Terbium chain in the form of S → (Tb3+)n → A (S = Ce3+ or Eu2+, A = Eu3+), as a promising energy transfer (ET) approach, has been proposed to enhance Eu3+ emission for solid-state lighting. However, the viewpoint of ET from S to A via the terbium chain (Tb3+-Tb3+-Tb3+-⋯) is very doubtful. Here, hosts of Ba3Ln(PO4)3, LnPO4, LnBO3, and Na2Ln2B 2O7 doped with Ce3+ → (Tb 3+)n → Eu3+ or (Tb3+) n → Eu3+ are synthesized to prove the universality of S → (Tb3+)n → A in inorganic hosts and to study the unsolved issues. Saturation distance of Tb3+-Eu3+, estimated with the empirical data of different hosts, is proposed to be a criterion for determining whether a spectral chromaticity coordinate keeps constant. A branch model is put forward to replace the chain model to explain the role of (Tb3+)n in ET from Ce3+ to Eu 3+ and the necessity of high content of Tb3+; the term "terbium bridge" is used to replace "terbium chain", and the value of n is determined to be two or three. The intensity quenching of Eu 3+ emission is attributed to the surface defects ascribed to the smaller particles and larger specific surface area rather than the concentration quenching of Tb3+. Based on the saturation distance and the mechanism of luminescence quenching, the necessary concentration of Tb 3+ for (Tb3+)n can be estimated as long as the cell parameters are already known and the luminescent efficiency of Eu 3+ can be further improved by optimizing the synthesis method to decrease the quantity of surface defects.

    Original languageEnglish
    Pages (from-to)10792-10801
    Number of pages10
    JournalACS Applied Materials and Interfaces
    Volume6
    Issue number13
    DOIs
    Publication statusPublished - 2014 Jul 9

    Keywords

    • LED
    • energy transfer
    • luminescence
    • phosphor
    • sensitization
    • terbium bridge

    ASJC Scopus subject areas

    • Materials Science(all)

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