Chen Geng, Yuan Lifang, Peng Chaoyue, Wu Haoyi, Jin Yahong
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, WaiHuan Xi Road, No. 100, Guangzhou 510006, China.
School of Electronics and Communications, Guangdong Mechanical & Electrical Polytechnic, Guangzhou 510515, China.
Dalton Trans. 2024 Feb 27;53(9):4214-4221. doi: 10.1039/d3dt04271e.
Recently, short-wave infrared (SWIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered increased attention due to their widespread applications in night vision, biological imaging, and non-destructive testing. Nevertheless, the currently used SWIR phosphors suffer from poor thermal stability and low quantum efficiency. In this study, a finely tuned spinel-based solid solution, MgZnGaO, is prepared to host Ni to induce SWIR emission. Cr is codoped as a sensitizer to bridge Cr and Ni ions, significantly enhancing blue light absorption and facilitating energy transfer (ET) to Ni ions. The champion SWIR phosphor exhibits a broadband emission centered at 1304 nm with a full width at half maximum (FWHM) of 250 nm, achieving a near-unity internal quantum efficiency (IQE = 97.7%) and a good thermal stability (70.7%@423 K). The fabricated SWIR pc-LED device delivers a high SWIR output power of 39.9 mW at 360 mA, enabling its application in non-destructive imaging and testing.
最近，短波红外（SWIR）磷光体转换发光二极管（pc-LEDs）因其在夜视、生物成像和无损检测中的广泛应用而受到越来越多的关注。然而，目前使用的SWIR磷光体存在热稳定性差和量子效率低的问题。在本研究中，制备了一种精细调谐的尖晶石基固溶体MgZnGaO来容纳Ni以诱导SWIR发射。Cr作为敏化剂进行共掺杂，以连接Cr和Ni离子，显著增强蓝光吸收并促进向Ni离子的能量转移（ET）。最佳的SWIR磷光体表现出以1304 nm为中心的宽带发射，半高宽（FWHM）为250 nm，实现了接近单位的内量子效率（IQE = 97.7%）和良好的热稳定性（423 K时为70.7%）。制造的SWIR pc-LED器件在360 mA时提供39.9 mW的高SWIR输出功率，使其能够应用于无损成像和检测。
