Does white LED made from MoS2 can be a future of lighting?
MoS2 quantum disks possess dual side light responsive, ultrathin, transparent, and flexible white LED’s.
A team of researchers from National Taiwan University, Taipei
has demonstrated a dual-side, responsive white LED with ultrathin, transparent,
and flexible characteristics based on Graphene Insulator Semiconductor
(GIS) structure.
The team achieved this work with 2D nanoflakes such as
Molybdenum disulfide (MoS2) quantum disks.
With the advances in the electronics industry, we can expect
ultra-thin, flexible, and transparent devices in the upcoming years. And LED
technology has a wide range of applications in the electronics industry. But
the conventional cannot be utilized for flexible and transparent electronic
devices.
And
the recent development in white LEDs mostly rely on using toxic-based
Cadmium-based quantum dots and lots of challenges are there such as lifetime,
toxicity, and high cost.
To
overcome the challenges, the research group at National Taiwan University has
demonstrated white LEDs based on 2D flakes of molybdenum disulfide (MoS2) the
material has high color quality, biocompatibility, and chemical stability.
The team fabricated and demonstrated the device based on a graphene insulator semiconductor structure which is very helpful in combining the superior properties of each constituent material in the device. The device was fabricated using monolayer graphene as a transparent electrode on top of a thin Al2O3 insulating layer deposited on a histidine-doped MoS2 quantum disks layer. Histidine (Env. Friendly dopant) helps to enhance the carriers and improve the carrier transport more rapidly in the electrical conductivity of MoS2 quantum disks.
The GIS device was deposited on patterned indium tin oxide (ITO) coated
flexible or glass substrate. Then the device exhibits a white EL spectrum
covering the whole visible light region under an external bias. Besides,
employing a transparent electrode, dual side emission can be accomplished via
GIS-white LED which is very helpful for a range of lighting device applications
like full-color displays, indoor illumination, etc. The device fabricated by
the team has an excellent performance in the photodetector mode with a fast
response time. And, it has multiple functionalities like light emission,
photodetection, transparency, flexibility and dual-side emissions. The team
claimed that GIS-white LED has great potential in the next generation of optoelectronic
devices.
Story
Source: https://doi.org/10.1016/j.mtnano.2022.100173
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