Tunable luminescence and improved thermostability via Tm―Dy energy transfer in a tellurooxyphosphate phosphor. (February 2023)

• Record Type: Journal Article
• Authors: Song, Ruitong; Li, Hong; Zhang, Hongzhi; Tang, Huan; Tang, Xiangkai; Yang, Jun; Zhao, Heyun; Zhu, Jing
• Is Part Of: Applied materials today. Volume 30(2023)
• Publication Date: 2023-02
• Subjects: Tellurooxyphosphate -- Energy transfer -- Color-tunable -- Thermostability -- White-emitting; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2022.101712
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: The luminous color regulation is achieved by the Tm 3+ →Dy 3+ energy transfer. The highly luminescent thermostability originates from the synergistic effect of the Dy 3+ →Tm 3+ back-energy transfer and high structural rigidity. The BTP:0.04Tm 3+, 0.06Dy 3+ -converted w-LED with high r a (88) and low CCT (3227 K) values was fabricated. Abstract: Currently, to solve the restrictions of multiple phosphors-converted white light-emitting diodes (w-LED) such as reabsorption and fabricating cost, the single-phase white-emitting phosphor-based w-LED stands a good chance. In this work, we present a type of color-tunable barium tellurooxyphosphate-based phosphor Ba2 TeP2 O9 (BTP):Tm 3+, Dy 3+ . Under 362 nm excitation, the emitting white color adjustment is realized due to the efficient Tm 3+ →Dy 3+ energy transfer. The energy transfer mechanism is ascribed to the dipole-dipole interaction with the 93.3% efficiency. Moreover, the synergistic effect of the Dy 3+ →Tm 3+ back-energy transfer and high Debye temperature contributes to the improvement of the luminescent thermostability. For the representative BTP:0.04Tm 3+, 0.06Dy 3+ phosphor, the emission at 423 K has only the intensity loss of 9.3%, relative to the initial value, and the chromaticity shifting level is 12.9 × 10 –3, verifying that it has comparable luminescence thermostability to the commercial products (such as CaAlSiN3 :Eu 2+ and BaMgAl10 O17 :Eu 2+ ). The BTP:0.04Tm 3+, 0.06Dy 3+ -based w-LED exhibits the satisfactory parameters of high R a (88) and low CCT (3227 K). Our work illustrates an effective energy transfer path between Tm 3+ and Dy 3+ for developing white-emitting phosphors with high thermostability for lighting application. Graphical abstract: Image, graphical abstract