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Violet and Ultraviolet Light-emitting Devices

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The field of light-emitting diodes has seen remarkable advancements, with perovskite LEDs (PeLEDs) achieving high external quantum efficiencies (EQEs) in the blue, green, red, and near-infrared spectrums. These PeLEDs are now on the cusp of rivaling the efficiencies of the renowned III-V-based LEDs. However, a significant challenge remains in harnessing the potential of ultraviolet light, which holds vast application promises, notably in disinfection. Current PeLEDs have underperformed in the violet/ultraviolet region, mainly due to issues related to thin-film quality.

In my journey, I am exploring the use of innovative metal halide material systems to bridge this gap and achieve efficient violet and ultraviolet LEDs. Dive in to discover how our research is charting a path toward cost-effective and high-performance ultraviolet PeLEDs.

Photon Upconversion: The Future of Solar Energy and Photocatalysis 

Imagine a world where we could merge two low-energy photons into one powerful photon. That's the magic of photon upconversion. By doing this, we can manipulate and optimize the energy of photons across different wavelengths, opening the door to a myriad of applications.

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One of the most compelling applications lies in the realm of photovoltaics. Typically, solar cells miss out on absorbing a significant portion of sunlight. In fact, nearly 50% of the sun's energy, mostly in the near-infrared (NIR) range, goes unutilized. By adapting upconversion techniques, we can convert this NIR light into higher-energy photons, allowing solar cells to tap into this vast reservoir of energy. But the wonders of photon upconversion don't end there. Consider photocatalysis, where catalysts are often bound by their bandgaps and mostly absorb only the high-energy portions of sunlight, such as ultraviolet and visible light. With upconversion, we're working towards expanding their absorption capabilities into the NIR region. This could revolutionize the efficiency and potential of photocatalytic systems.

Join me in exploring how photon upconversion can shape a brighter, more energy-efficient future!