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Efficient and stable cyan phosphor Ca2LuZr2Al3O12:Ce3+ for full-spectrum LEDs
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DOI：10.1364/OL.562141.png)
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Abstract
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Full-spectrum light-emitting diodes (LEDs) are considered as the next health lighting sources, while the cyan gap severely affects the color rendering index (CRI) (Ra < 95). In this work, a series of Ce3+-doped Ca2GdZr2Al3O12, Ca2LuHf2Al3O12, Ca2GdHf2Al3O12, and Ca2LuZr2Al3O12 cyan phosphors were synthesized successfully, in which Ca2LuZr2Al3O12:Ce3+ is well matched with the 410 nm LED chip and emits a bright cyan light (centered at 490 nm) with an excellent external quantum efficiency (EQE = 55%) and good thermal stability (I-423 K-/298 K = 72%). Based on the first-principles theory calculations, the excellent EQE and good thermal stability were contributed to the large bandgap and high structural rigidity. Finally, a high performance full-spectrum white LED (w-LED) device was fabricated, which achieved a high color rendering index (Ra = 96.4) and a low correlated color temperature (CCT = 4358 K). (c) 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
Keywords:
EMITTING PHOSPHOR
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