Inducing octahedral distortion to enhance NIR emission in Cr-doped garnet Ca(Al, Sc)GeO
Journal of Materials Chemistry C, ISSN: 2050-7534, Vol: 11, Issue: 25, Page: 8462-8469
2023
- 29Citations
- 20Captures
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Article Description
An efficient Cr-activated broadband near-infrared (NIR) phosphor is the key enabler to integrate compact NIR light-emitting diodes (pc-LEDs) for food testing and medical detection applications. High luminescence efficiency is key for the practical applications of phosphors. Herein, we design a series of efficient Cr-doped CaAlScGeO garnet phosphors to induce octahedral distortion for enhancing NIR luminescence efficiency. We adopt the best fitted ideal polyhedron to characterize the octahedral distortion and found that the degree of distortion reaches its maximum at y = 0.2 and decreases with y deviating from 0.2. As a result, the composition with y = 0.2 shows the highest luminescence intensity. The composition dependence of the octahedral distortion coincides with that of the luminescence intensity, indicating that the luminescence properties of CaAlScGeO:Cr are closely related to the octahedral distortion. The luminescence internal/external quantum efficiency (IQE/EQE) is significantly enhanced from 65.4%/25.7% in CaAlGeO:0.04Cr to 85.4%/33.5% in CaAlScGeO:0.04Cr. The optimal CaAlScGeO:0.04Cr phosphor exhibits excellent luminescence thermal stability (∼91% at 423 K) and high NIR output power (38.2 mW at 100 mA) with an electro-optical conversion efficiency of 13.7%. This work provides a strategy for enhancing the NIR luminescence of Cr
Bibliographic Details
Royal Society of Chemistry (RSC)
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