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1.福州大学 化学学院, 福建 福州 350108
2.中国科学院福建物质结构研究所 中国科学院功能纳米结构设计与组装重点实验室, 福建省纳米材料重点实验室, 福建 福州 350002
3.厦门稀土材料研究所 厦门市稀土光电功能材料重点实验室, 福建 厦门 361021
4.中国科学院 赣江创新研究院, 江西 赣州 341000
Received:05 May 2022,
Revised:17 May 2022,
Published:05 September 2022
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何献国,黄得财,宋丽平等.NaAlP2O7∶Cr3+荧光粉近红外发光特性[J].发光学报,2022,43(09):1380-1389.
HE Xian-guo,HUANG De-cai,SONG Li-ping,et al.Near-infrared Photoluminescence Properties of NaAlP2O7∶Cr3+ Phosphor[J].Chinese Journal of Luminescence,2022,43(09):1380-1389.
何献国,黄得财,宋丽平等.NaAlP2O7∶Cr3+荧光粉近红外发光特性[J].发光学报,2022,43(09):1380-1389. DOI: 10.37188/CJL.20220180.
HE Xian-guo,HUANG De-cai,SONG Li-ping,et al.Near-infrared Photoluminescence Properties of NaAlP2O7∶Cr3+ Phosphor[J].Chinese Journal of Luminescence,2022,43(09):1380-1389. DOI: 10.37188/CJL.20220180.
宽带近红外荧光粉转换型LED光源在医学成像、食品检测以及传感等领域展现出了巨大的应用前景,该类光源的光谱和效率与所用近红外荧光粉的性能紧密相关,Cr
3+
离子激活的近红外发光材料具有可被蓝光有效激发、发射光谱可调等优点,因此得到了重点关注。本文采用高温固相法制备了NaAlP
2
O
7
∶Cr
3+
宽带近红外发光荧光粉,该材料在450 nm蓝光激发下,发射出650~1 000 nm的近红外光,峰值位于780 nm,半高宽为 1 580 cm
-1
;其在423 K下的发光强度能够维持室温下的71%,表现出良好的发光热稳定性。对材料的晶体结构和变温光谱(8~503 K)进行了系统的分析,计算得到了Cr
3+
离子在NaAlP
2
O
7
基质中的晶体场强度等参数;利用8 K低温光谱,并结合计算,分析了Cr
3+
各能级零声子线;基于高温变温光谱,讨论了材料的电⁃声子耦合效应及荧光热猝灭机理。
Near-infrared phosphor-converted light-emitting diode(NIR pc-LED) light source has a great application prospect in medical imaging, food detection, sensing and other aspects. The spectral characteristic and photoelectric conversion efficiency of the pc-LEDs are highly dependent on the performance of NIR phosphors. Currently, the development of inexpensive, efficient, and thermally stable broadband NIR phosphors remains a great challenge. Among the potential broadband NIR phosphors, the Cr
3+
activated NIR materials have attracted serious attentions due to their advantages of being able to be excited efficiently by blue light and tunable emission band. In this study, a broadband NIR phosphor NaAlP
2
O
7
∶Cr
3+
was successfully synthesized by high temperature solid-state method. Under 450 nm blue light excitation, the phosphor shows a broadband emission covering 650-1 000 nm with a peak centered at ~780 nm and a full width at half-maximum(FWHM) of 1 580 cm
-1
. Particularly, at 423 K, the NaAlP
2
O
7
∶4%Cr
3+
sample retained ~71% of the photoluminescence(PL) intensity at room temperature, exhibiting good PL thermal stability. Furthermore, the crystallographic site occupation and crystal field strength parameter of Cr
3+
ions in NaAlP
2
O
7
host were investigated based on the structural analysis and temperature-dependent(8-503 K) spectra of the phosphor. The zero-phonon lines of Cr
3+
energy levels were determined by low temperature spectroscopy at 8 K and theoretical calculation. The PL thermal quenching mechanism of Cr
3+
was discussed in combination with high temperature dependent spectra. In summary,
this work presents a new broadband NIR phosphor for application in NIR pc-LEDs, and highlights some strategies to explore this class of materials.
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