Sr2(Ga/Al)TaO6:Cr3+phosphor with tunable near-infrared emitting for light-emitting diodes and optical thermometer

被引：15

作者：

Han, Mingxiao ^{[1
]}

Chen, Shuyang ^{[1
]}

Li, Jie ^{[1
]}

Gao, Zhexuan ^{[1
]}

Zhang, Yi ^{[1
]}

Shen, Yang ^{[1
]}

Tian, Ying ^{[1
]}

Deng, Degang ^{[1
]}

机构：

[1] China Jiliang Univ, Inst Optoelect Mat & Devices, Key Lab Rare Earth Optoelect Mat & Devices Zhejian, Hangzhou 310018, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 973卷

基金：

中国国家自然科学基金;

关键词：

Near-infrared phosphor; Chromium ion doping; Fluorescence intensity ratio; Pc-LED; LUMINESCENCE; EMISSION; PHOTOLUMINESCENCE; PHOSPHORS;

D O I：

10.1016/j.jallcom.2023.172927

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Near-infrared (NIR) phosphors is feasible for night vision and optical thermometry applications. We synthesized several NIR/red light-emitting Sr2(Ga/Al)TaO6:Cr3+ phosphors using a high-temperature solid-state reaction approach and then conducted in-depth research on the crystal structure, luminescence properties, quantum yields and temperature dependence of the materials. Adjusting the concentrations of Ga3+ and Al3+ within the tantalate host makes it possible to regulate the crystal field environment containing Cr3+ ions, thereby tuning their emission bandwidth. The occupancy of Cr3+ in Sr2(Ga/Al)TaO6 was discussed based on structural refinement and first principles. The results demonstrated that in the Sr2(Ga/Al)TaO6 host, Cr3+ ions occupied Ga3+/ Al3+ and Ta5+ sites, exhibiting narrow-band emission derived from the 2E -> 4A2 transition and broad-band emission resulting from the 4T2 -> 4A2 transition, respectively. Sr2GaTaO6:Cr3+ phosphor possesses a full width at half maximum of 130.9 nm at 473 K and maintains 67.85% thermal stability compared with ambient temperature when measured at 373 K. The integration of a light-emitting diode (LED) chip and a Sr2GaTaO6:Cr3+ phosphor was prepared as an NIR pc-LED device and applied to night vision, demonstrating its good potential in the field of NIR imaging. Furthermore, in the Sr2AlTaO6 host, the emission of Cr3+ ions at 707 nm (4T2 -> 4A2 transition) and 740 nm (2E -> 4A2 transition) exhibited opposite temperature dependent characteristics. Using the utilization of fluorescence intensity ratio (FIR) technology, the relative sensitivity of Sr2AlTaO6:Cr3+ phosphor as an optical ratiometric thermometer could reach 2.18% K-1 at 293 K, demonstrating a prospective application for the material in temperature sensing.

引用

页数：12