Tunable broadband near-infrared photoluminescence of Mg2LaTaO6:Cr3+ phosphors for light-emitting diodes

IF 3.3 3区物理与天体物理 Q2 OPTICS Journal of Luminescence Pub Date : 2023-11-13 DOI:10.1016/j.jlumin.2023.120314

Qianwen Cao , Liang Li , Jing Xie , Yule Zhang , Wenming Wang , Yan Pan , Xiantao Wei , Yong Li

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Abstract

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LED) prepared with near-infrared (NIR) phosphors have potential applications in various aspects. In this paper, Cr³⁺-activated Mg₂LaTaO₆ (MLTO: Cr³⁺) phosphors were prepared by the conventional high-temperature solid-phase method. The structure, morphology, and photoluminescence (PL) spectra of MLTO: Cr³⁺ phosphor were investigated. There is broadband NIR emission and the emission peak is red-shifted with the increase of doping concentration. The crystal field strengths of the samples were calculated and the relationship between the emission peak positions of the samples and the crystal field strengths was investigated. In addition, the concentration quenching mechanism of the samples was discussed, which is mainly attributed to dipole-dipole interactions. The internal quantum efficiency (IQE) of the MLTO: 0.4 mol% Cr³⁺ sample was measured with an IQE value of 76.48 %. NIR pc-LED devices were fabricated by combining the prepared MLTO: Cr³⁺ phosphor and blue-emitting LED chips, which are capable of emitting NIR light.

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用于发光二极管的Mg2LaTaO6:Cr3+荧光粉的可调谐宽带近红外光致发光

利用近红外荧光粉制备的近红外磷光转换发光二极管(NIR pc-LED)具有广泛的应用前景。本文采用常规高温固相法制备了Cr3+活化的Mg2LaTaO6 (MLTO: Cr3+)荧光粉。研究了MLTO: Cr3+荧光粉的结构、形态和光致发光光谱。随着掺杂浓度的增加，发射峰发生红移。计算了样品的晶体场强，研究了样品的发射峰位置与晶体场强的关系。此外，还讨论了样品的浓度猝灭机理，其主要原因是偶极-偶极相互作用。测量了MLTO: 0.4 mol% Cr3+样品的内量子效率(IQE)， IQE值为76.48%。将制备的MLTO: Cr3+荧光粉与能够发射近红外光的蓝光LED芯片相结合，制备了近红外光pc-LED器件。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.