Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes. Issue 11 (7th April 2022)

• Record Type: Journal Article
• Authors: Wang, Ye; Wang, Zhijun; Wei, Guohui; Yang, Yuanbo; He, Shaoxuan; Li, Jiehong; Shi, Yawei; Li, Rui; Zhang, Jiawei; Li, Panlai
• Is Part Of: Advanced optical materials. Volume 10:Issue 11(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-07
• Subjects: internal quantum yield -- luminescence -- near‐infrared pc‐LED -- phosphors -- phosphor‐converted light‐emitting diodes -- thermal stability; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200415
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes ( pc ‐LED) are ideal light sources to meet the next generation of NIR spectroscopy. However, NIR phosphors have numerous problems such as low quantum yields (QY) and low thermal stability. In this work, a series of Gd3 Y x In x Ga5‐2 x O12 :Cr 3+ NIR broadband phosphors with high internal quantum yields (IQYs) and high thermal stability are discovered by uniquely replacing GaO6 in Gd3 Ga5 O12 with Y 3+ and In 3+ in a co‐doped manner through cation modulation. Under 449 nm excitation, Gd3 Y0.5 In0.5 Ga4 O12 (GYIG): y Cr 3+ depicts emission from 650 to 1050 nm with a full‐width at half maximum (FWHM) of 134 nm. The emission intensity reaches its optimum value at y = 6%, while the IQY reaches an impressive 81.8% and, at 375 K, the emission intensity remains at room temperature of 94.1%. Excitingly, the obtained phosphors are made into pc ‐LEDs. At 0.28 W output power and 0.1 A output current, NIR pc ‐LED has a NIR photoelectricity conversion efficiency of 15%; more promising is that when the output power is increased to 2.247 W, the pc ‐LED photoelectric conversion efficiency can still maintain at 8.5%, which can be applied in different fields such as plant lighting, night vision, biological tissue penetration, and object detection. Abstract : A high‐efficiency, thermally stable, and broadband near‐infrared phosphor‐converted light‐emitting diode ( pc ‐LED) based on Gd3 Y0.5 In0.5 Ga4 O12 :Cr 3+ phosphor is rationally fabricated for the first time, using to regulate plant growth, night vision, object detection, and biological tissue penetration.