Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 3, Pages 4265-4275Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c20084
Keywords
Ni2+; shortwave infrared; broadband emission; SWIR LED; spectroscopy
Funding
- National Natural Science Foundation of China [51972065, 51802045]
- Guangzhou basic and applied basic research project [202102020871]
- Special Fund for Scientific and Technological Innovation Strategy of Guangdong Province [2018A030310539]
- Ministry of Science and Technology of Taiwan
- MOST [109-2113-M-002-020-MY3]
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A high-performance Ni2+-doped garnet solid-solution broadband SWIR emitter was successfully fabricated, and a synergetic enhancement strategy was proposed to improve its performance, which opens up possibilities for exploring novel broadband SWIR phosphors.
Broadband shortwave infrared (SWIR) light-emitting diodes (LEDs), capable of advancing the next-generation solid-state smart invisible lighting technology, have sparked tremendous interest and will launch ground-breaking spectroscopy and instrumental applications. Nevertheless, the device performance is still suppressed by the low quantum efficiency and limited emission bandwidth of the criti cal phosphor layer. Herein, we report a high-performance Ni2+-doped garnet solid-solution broadband SWIR emitter centered at similar to 1450 nm with a large full-width at half-maximum of similar to 300 nm, thereby fabricating, for the first time, a directly excited Ni2+-doped garnet solid-solution phosphor-converted broadband SWIR LED device. A synergetic enhancement strategy, adding a fluxing agent and a charge compensator simultaneously, is proposed to deliver a more than 20-fold increase of the SWIR emission intensity and nearly 2-fold improvement of the thermal quenching behavior. The site occupation and mechanism behind the synergetic enhancement strategy are elucidated by a combination of experimental study and theoretical calculation. A prototype of the SWIR LED with a radiation flux of 1.25 mW is fabricated and utilized as an invisible SWIR light source to demonstrate the SWIR spectroscopy applications. This work not only opens a window to explore novel broadband SWIR phosphors but also provides a synergetic strategy to remarkably improve the performance of artificial SWIR LED light sources.
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