光致发光
材料科学
蓝移
荧光粉
红外线的
宽带
分析化学(期刊)
光电子学
光学
物理
化学
色谱法
作者
Qiuming Lin,Yan Li,Xiaozhong Wu,Jiaqing Peng,Weixiong You,Decai Huang,Xinyu Ye
标识
DOI:10.1002/adom.202302687
摘要
Abstract Cr 3+ ‐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 NaSr 2 XGe 5 O 14 (X = Al, Ga, Sc, and In) as hosts, which possess a large band gap and multiple sites for the substitution of Cr 3+ ions. NaSr 2 XGe 5 O 14 :Cr 3+ 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% (NaSr 2 GaGe 5 O 14 : Cr 3+ ) to 87.5% (NaSr 2 ScGe 5 O 14 : Cr 3+ ). 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.
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