Self‐Activated Tungstate Phosphor for Near‐Infrared Light‐Emitting Diodes. Issue 23 (7th September 2022)

• Record Type: Journal Article
• Authors: Wu, Sheng; Xiong, Puxian; Liu, Quan; Xiao, Yao; Sun, Yongsheng; Song, Enhai; Chen, Yan
• Is Part Of: Advanced optical materials. Volume 10:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-07
• Subjects: light‐emitting diodes -- near infrared -- night vision -- phosphors -- self‐activated -- tungstate; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201718
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) are promising for many applications in non‐destructive testing, bio‐imaging, and modern agriculture. However, developing self‐activated NIR phosphors with high efficiency and excellent thermal stability is a great challenge for current research. In this work, a self‐activated far‐red to NIR emitting NaLaMgWO6 phosphor is prepared by the high‐temperature solid‐state reaction method, whose luminescence properties are investigated in detail. In addition, the introduction of Bi 3+ ions as sensitizers enhances the emission intensity of far‐red to NIR light (650‐850 nm) through a Bi 3+ → WO6 6– energy transfer design strategy, resulting in an increased internal quantum efficiency (IQE) from 56.4% to 64.8% and thermal stability from 54% to 72% (420 K). Finally, the combination of NaLaMgWO6 :Bi 3+ with 365/460 nm commercial LED chip is prepared into NIR pc‐LED devices, demonstrating satisfactory performance in the field of night vision detection and other wide range of practical applications. Abstract : A self‐activated tungstate NaLaMgWO6 :Bi 3+, as a potential near‐infrared light‐emitting diode (NIR LED) phosphor, is reported to have excellent photoluminescence (internal quantum efficiency of up to 64.8%) and thermal stability (luminescence intensity at 420 K is 72% of room temperature), which demonstrates the potential applications of phosphor‐converted NIR LED in the night vision field.