Structure, luminescence properties and energy transfer of Tb³⁺–Eu³⁺ codoped LiBaB₉O₁₅ phosphors

Abstract

A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-temperature solid-state reaction process. The structure and luminescence properties of phosphors are described. The LiBaB9O15:Tb(3+) phosphor shows a characteristic green emission, with the peak located at 551 nm, which corresponds to the (5)D4→(7)F5 transition of Tb(3+). The LiBaB9O15:Eu(3+) phosphor presents an obvious red emission, with the peak located at 617 nm, which is ascribed to the (5)D0→(7)F2 transition of Eu(3+). The highly intense red emission peaks of the Eu(3+) ions were attributed to an effective energy transfer from the Tb(3+) to Eu(3+) ions in LiBaB9O15:Tb(3+),Eu(3+), which has been verified through the luminescence spectra and the fluorescence decay dynamics. The results mean that LiBaB9O15:Tb(3+),Eu(3+) phosphors might have potential applications as a red emitting phosphor for white LEDs.

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

“…Such Tb 3+ →Eu 3+ energy transfer has previously been observed, for instance, in Tb 3+ /Eu 3+ doped solid‐state phosphors as well as in molecular compounds . Note that in case of needle‐like 3 a , the relative Tb 3+ emission is even weaker than in the case of 3 b and 3 c indicating a more efficient Tb 3+ →Eu 3+ energy transfer in 3 a . Additional data and discussion of the excitation and energy‐transfer pathways are given in the Supporting Information (Figures S3–5).…”

“…Complex 3 further exhibits weak emission centered at around 545 nm, being ascribed to the 5 D 4 → 7 F 5 transition of the Tb 3+ ion which is the most dominant Tb 3+ emission as also seen for complex 2 . This very weak emission indicates efficient energy transfer from Tb 3+ to Eu 3+ . Such Tb 3+ →Eu 3+ energy transfer has previously been observed, for instance, in Tb 3+ /Eu 3+ doped solid‐state phosphors as well as in molecular compounds .…”

“…Eu 3 + energy transfer in 3a. [47] Additional data and discussion of the excitation and energy-transfer pathways are given in the Supporting Information ( Figures S3-5).…”

Tunable white light emission from hafnium oxide films co‐doped with trivalent terbium and europium ions deposited by Pyrosol technique

“…PL absolute quantum efficiency (QE) of the sample labeled as S2 was measured (five times); the averaged value obtained was 47%, when it was excited with 382 nm and 78% if the sample is excited with 280 nm. The QE values were calculated by the following equation : where L emission is the emission spectrum of the studied sample, E sample is the spectrum of the light used for exciting the sample and E blanc is the spectrum of the excitation light without the sample in the integration sphere. The values obtained in this material (HfO 2 : Tb 3+ + Eu 3+ ) for quantum efficiency are high and are suitable for various applications, for example in white LEDs excited with near UV radiation :…”

Energy transfer, tunable luminescence, and thermal stability of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors

“…(donor) to Sm 3? (acceptor) most likely occurs [18], resulting in the enhanced Sm 3? emissions at the cost of Tb 3?…”