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Highly thermoduric and efficient nir-emitting garnet Ca3Sc2Ge3O12: Cr3+/Ni2+ via synergistic A/C-site regulations with controllably afterglow behaviors for customized applications
Xingyu Li, Jian Peng, Zihao Xu, Wanyuan Li, Biao Xu, Chunyu Li, Wubin Dai*
https://doi.org/10.1016/j.cjsc.2026.101103
Garnet Ca3Sc2Ge3O12; NIR (L)PL; Cr3+/Ni2+; Chemical unit co-substitution; pc-LED
ABSTRACT
Simultaneous realizations of high thermal stability and quantum efficiency (QE) in phosphors with near-infrared (NIR) photoluminescence (PL) and long-persistent PL (LPL) attributes are a daunting task. Herein, we have come up with a dual-site co-substitution scheme in Ca3Sc2Ge3O12: Cr3+/Ni2+ to concurrently actualize high-quality NIR-I/II (L)PL via either equivalent or aliovalent co-substitution at indirect lattice A/C sites of [Y3+ + Al3+] or [Y3+ + Si4+] for [Ca2+ + Ge4+]. Both Cr3+ and Ni2+ are colonized at B site (Sc3+) under weak crystal field environment and emitting continuous PL across NIR-I/II regions via energy transfer from Cr3+ to Ni2+ under blue-light excitation. Due to inequivalent replacement of Ni2+ at Sc3+ site and consequential production of defects, a charming NIR LPL is also gained. Further incorporation of [Y3+ + Al3+] unit begets densified robust framework with [Sc(Cr/Ni)O6] octahedral distortion, elucidating the mechanism of improved properties in PL QE (76.23%) and stability (89.5%@423 K). While [Y3+ + Si4+] modulation in Ca3Sc2Ge3O12 not only brings rigid structure but also suppresses defects (LPL) because of equivalent triple-unit between Y3+/Si4+/Ni2+ and Ca2+/Ge4+/Sc3+. A NIR pc-LED based on the designed phosphor with a commercial 460 nm blue LED chip is fabricated and reveals multi-applications in nondestructive detection, bioimaging, and anticounterfeiting. This work provides new perspectives for developing high-performance NIR-emitting phosphor materials.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1