Enhanced near-infrared emission in Pr3+/ Cr3+ co-doped Ca3Sc2Ge3O12:Cr3+ phosphor for biometric illumination

IF 3.8 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2026-05-01 Epub Date: 2026-03-06 DOI:10.1016/j.infrared.2026.106495

Weiquan Zeng , Shuang Zhao , Changfu Xu , Haiyan Shi , Yan Yuan , Xiaohong Zhang , Zhaoqi Liu , Pengbo Lyu , Lizhong Sun

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引用次数: 0

Abstract

Near-infrared (NIR) Cr³⁺-doped phosphors are promising candidates for biometric illumination, yet their practical use is often restricted by limited luminescence efficiency. In this work, Ca₃Sc₂Ge₃O₁₂:Cr³⁺ (CSG:Cr³⁺) and Pr³⁺/Cr³⁺ co-doped Ca₃Sc₂Ge₃O₁₂ (CSG:Cr³⁺,Pr³⁺) phosphors were synthesized via a high-temperature solid-state reaction. Pr³⁺ ions acted as sensitizers and effectively enhanced the Cr³⁺ emission through energy transfer, enabling the co-doped sample to achieve an internal quantum efficiency of 56.8% and an external quantum efficiency of 7.72%. An NIR pc-LED device was further fabricated by combining the CSG:Cr³⁺,Pr³⁺ phosphor with a blue LED chip, which delivered stable photoelectrical conversion under a 100 mA driving current. The device was successfully used for iris and vein imaging, demonstrating its applicability for biometric acquisition.

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Pr3+/ Cr3+共掺杂Ca3Sc2Ge3O12:Cr3+荧光粉增强近红外发射，用于生物识别照明

近红外（NIR） Cr3+掺杂荧光粉是生物识别照明的理想选择，但其实际应用往往受到有限的发光效率的限制。通过高温固相反应合成了Ca3Sc2Ge3O12:Cr3+ (CSG:Cr3+)和Pr3+/Cr3+共掺杂的Ca3Sc2Ge3O12 （CSG:Cr3+,Pr3+）荧光粉。Pr3+离子作为敏化剂，通过能量转移有效增强了Cr3+的发射，共掺杂样品的内量子效率为56.8%，外量子效率为7.72%。将CSG:Cr3+，Pr3+荧光粉与蓝色LED芯片相结合，制备了近红外pc-LED器件，该器件在100ma驱动电流下实现了稳定的光电转换。该装置已成功用于虹膜和静脉成像，证明了其在生物特征采集方面的适用性。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.