Ni2+-Doped Garnet Solid-Solution Phosphor-Converted Broadband Shortwave Infrared Light-Emitting Diodes toward Spectroscopy Application
Journal
ACS Applied Materials and Interfaces
Journal Volume
14
Journal Issue
3
Pages
4265-4275
Date Issued
2022
Author(s)
Abstract
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 critical phosphor layer. Herein, we report a high-performance Ni2+-doped garnet solid-solution broadband SWIR emitter centered at ?1450 nm with a large full-width at half-maximum of ?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. ?
Subjects
broadband emission
Ni2+
shortwave infrared
spectroscopy
SWIR LED
Garnets
Infrared radiation
Infrared spectroscopy
Light emission
Light emitting diodes
Phosphors
Broadband emission
Infrared light emitting diodes
Infrared light-emitting diodes
Performance
Short wave infrared
Shortwave infrared light-emitting diode
Spectroscopy applications
Synergetics
Solid solutions
SDGs
Type
journal article