Blueshift and Photoluminescence Enhancement in Broadband Near‐Infrared Emitting Phosphor NaSr2(Al/Ga)Ge5O14: Cr3+ Dependence on the Sc/In Substitution

• Published in: Advanced optical materials 2024-05, Vol.12 (13), p.n/a
• Main Authors: Lin, Qiuming, Li, Yan, Wu, Xiaozhong, Peng, Jiaqing, You, Weixiong, Huang, Decai, Ye, Xinyu
• Format: Article
• Language: English
• Subjects: Aluminum; Broadband; Cr3; Light emitting diodes; Near infrared radiation; near‐infrared; Phosphors; phosphor‐converted light‐emitting diodes; Photoelectricity; Photoluminescence; Quantum efficiency; Substitution reactions; tetrahedral luminescence; Trivalent chromium
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.202302687

Cr3+‐activated near‐infrared (NIR) phosphors have gained extensive attention for use in NIR phosphor‐converted light‐emitting diodes (pc‐LEDs), which are required for smart NIR spectroscopy techniques. Nevertheless, obtaining broadband NIR‐emitting phosphors with outstanding thermal stabilities and photoluminescence (PL) efficiencies remains a significant challenge. Herein, considering NaSr2XGe5O14 (X = Al, Ga, Sc, and In) as hosts, which possess a large band gap and multiple sites for the substitution of Cr3+ ions. NaSr2XGe5O14:Cr3+ phosphors are successfully prepared using a solid‐state reaction technology. Upon blue light excitation, the phosphors cover a broad NIR emission band in 650–1100 nm region. Notably, an abnormal blueshift and PL enhancement are observed following the substitution of Al/Ga with Sc/In. In particular, the PL internal quantum efficiency is improved from 34.5% (NaSr2GaGe5O14: Cr3+) to 87.5% (NaSr2ScGe5O14: Cr3+). Moreover, the manufactured NIR pc‐LED exhibited an exceptional photoelectric efficiency of 17.7% with an NIR output power of 10.2 mW at 20 mA, and its potential application in nondestructive detection is demonstrated. An abnormal blueshift and PL enhancement of NaSr2(Al/Ga)Ge5O14: Cr3+ phosphors are observed following the substitution of the Al/Ga by Sc/In due to a weaker electron–phonon coupling effect. Particularly, the PL internal quantum efficiency is improved from 34.5% to 87.5%, and the applications in accurate nondestructive detection are demonstrated by the as‐fabricated NIR pc‐LED with the photoelectric efficiency of 17.7%.