Maciej GRZEGORCZYK1, Natalia MAJEWSKA1, Ru-Shi LIU2, Sebastian MAHLIK1
1Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk,
Wita Stwosza 57, 80-308 Gdansk
2Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
The near-infrared (NIR) light source is desirable for real-time non-destructive examination applications, including food freshness analysis, health monitoring, infrared cameras, agriculture, and bio-applications. [1-4] The light emission spectra of such infrared light sources should be broad as possible for effective performance because of the broad absorption and reflection of light by the organic elements present in foodstuffs and human health in the blue and NIR regions of the electromagnetic spectrum, respectively. NIR phosphor-converted light-emitting diodes (pc-LEDs) are poised to replace conventional lamps due to their high efficiency and compact design. With the maturity of blue LED chips, pc-LEDs with broadband emission have been recently proposed as a suitable and efficient NIR light source in portable devices.
In this study, the most recently developed broadband near-infrared phosphors and their applications are presented. The most attention is paid to materials activated by Cr3+, Cr4+ and Ni2+ ions as an ideal candidate for producing IR light offering emissions across a wide spectrum from 700 to 1700 nm. [5], [6]
Literature
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