Abstract

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have demonstrated great potential for optoelectronic and biomedical applications, while the exploration of NIR phosphors with high thermal stability remains a challenge. Herein, we report an NIR phosphor KAl₁₁O₁₇:Fe³⁺ with zero thermal quenching (TQ) behavior up to 200°C. The asymmetrical broadband NIR emission with three sub-bands centered at 700, 770, and 800 nm is related to the superposition of different Fe³⁺ emission centers located in Al₂O₄, Al₃O₆, and Al₄O₆ sites of the KAl₁₁O₁₇ host, respectively. Temperature- and Fe³⁺ concentration-dependent emission spectra verify that the energy transfer (ET) between multiple Fe³⁺ emitters and the weak electron–phonon coupling (EPC) effect contribute to the thermally stable broadband NIR emission. The fabricated NIR pc-LED using optimized KAl₁₁O₁₇:Fe³⁺ phosphor exhibits great potential in information encryption applications.

© 2023 Optica Publishing Group

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