Research Project: YENİ BİR OPTİK İPEK YOLU: BİYO VE NANO-OPTİK UYGULAMALAR İÇİN İPEK ENTEGRE OPTİĞİ
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Contributors
Funders
ID
TB.00217
Authors
Nizamoğlu, Sedat
Faculty Member
Publications
Ecofriendly and efficient luminescent solar concentrators based on fluorescent proteins
(American Chemical Society, 2019) Çonkar, Deniz; Jalali, Houman Bahmani; Karalar, Elif Nur Fırat; Karatüm, Onuralp; Melikov, Rustamzhon; Nizamoğlu, Sedat; Sadeghi, Sadra; Srivastava, Shashi Bhushan; Department of Electrical and Electronics Engineering; Department of Molecular Biology and Genetics; Graduate School of Sciences and Engineering; Yes; College of Engineering; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
In recent years, luminescent solar concentrators (LSCs) have received renewed attention as a versatile platform for large-area, high-efficiency, and low-cost solar energy harvesting. So far, artificial or engineered optical materials, such as rare-earth ions, organic dyes, and colloidal quantum dots (QDs) have been incorporated into LSCs. Incorporation of nontoxic materials into efficient device architectures is critical for environmental sustainability and clean energy production. Here, we demonstrated LSCs based on fluorescent proteins, which are biologically produced, ecofriendly, and edible luminescent biomaterials along with exceptional optical properties. We synthesized mScarlet fluorescent proteins in Escherichia coli expression system, which is the brightest protein with a quantum yield of 61% in red spectral region that matches well with the spectral response of silicon solar cells. Moreover, we integrated fluorescent proteins in an aqueous medium into solar concentrators, which preserved their quantum efficiency in LSCs and separated luminescence and wave-guiding regions due to refractive index contrast for efficient energy harvesting. Solar concentrators based on mScarlet fluorescent proteins achieved an external LSC efficiency of 2.58%, and the integration at high concentrations increased their efficiency approaching to 5%, which may facilitate their use as “luminescent solar curtains” for in-house applications. The liquid-state integration of proteins paves a way toward efficient and “green” solar energy harvesting.
Quantum dot white leds with high luminous efficiency
(OSA - The Optical Society, 2018) Aria, Mohammad Mohammadi; Jalali, Houman Bahmani; Kumar, Baskaran Ganesh; Melikov, Rustamzhon; Nizamoğlu, Sedat; Sadeghi, Sadra; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Yes; College of Engineering; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
Colloidal quantum dots (QDs) have attracted significant attention in the last three decades due to high quantum yield (QY) and tunable electronic properties via quantum confinement effect and material composition. However, their utilization for efficient solid-state lighting sources has remained a challenge due to the decrease of QY from the synthesis batch in the liquid state to the host matrix in the solid state, which is also known as the host material effect. Here, we suppress the host material effect by simple liquid-state integration in light-emitting diodes (LEDs) that lead to a luminous efficiency of 64 lm/W for red, green, blue (RGB)-based and 105 lm/W for green, blue (GB)-based white light generation. For that, we maximized the QY of red- and green-emitting QDs by optimizing synthesis parameters and integrated efficient QDs with QY up to 84% on blue LED dies in liquid form at appropriate injection amounts for high-efficiency white lighting. Liquid-state integration showed two-fold and six-fold enhancement of efficiency in comparison with incorporation of QDs in polydixnethylsiloxane film and close-packed formation, respectively. Our theoretical calculations predicted that the luminous efficiency of liquid QD-LEDs can reach over 200 lm/W. Therefore, this study paves the way toward ultra-high-efficiency QD-based lighting.
Fluorescent protein integrated white LEDs for displays
(Institute of Physics (IOP) Publishing, 2016) Çonkar, Deniz; Karalar, Elif Nur Fırat; Melikov, Rustamzhon; Nizamoğlu, Sedat; Press, Daniel Aaron; Department of Electrical and Electronics Engineering; Department of Molecular Biology and Genetics; Yes; College of Engineering; College of Sciences
The usage time of displays (e.g., TVs, mobile phones, etc) is in general shorter than their functional life time, which worsens the electronic waste (e-waste) problem around the world. The integration of biomaterials into electronics can help to reduce the e-waste problem. In this study, we demonstrate fluorescent protein integrated white LEDs to use as a backlight source for liquid crystal (LC) displays for the first time. We express and purify enhanced green fluorescent protein (eGFP) and monomeric Cherry protein (mCherry), and afterward we integrate these proteins as a wavelength-converter on a blue LED chip. The protein-integrated backlight exhibits a high luminous efficacy of 248 lm/W-opt and the area of the gamut covers 80% of the NTSC color gamut. The resultant colors and objects in the image on the display can be well observed and distinguished. Therefore, fluorescent proteins show promise for display applications.
Ultra-efficient and high-quality white light-emitting devices using fluorescent proteins in aqueous medium
(Wiley, 2020) Çonkar, Deniz; Karalar, Elif Nur Fırat; Melikov, Rustamzhon; Nizamoğlu, Sedat; Sadeghi, Sadra; Department of Electrical and Electronics Engineering; Department of Molecular Biology and Genetics; Graduate School of Sciences and Engineering; Yes; College of Engineering; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
The transformation of electronics toward “green” and efficient devices is critical for the environmental sustainability and energy future. So far, majority of efficient lighting devices have been realized by artificial optical materials such as rare-earth-elements-doped phosphors, colloidal quantum dots (QDs) and dyes. In this study, red-emitting mScarlet and green-emitting eGFP fluorescent proteins are determined for high-performance white LEDs, expressed in living Escherichia coli and the purified proteins are integrated in their natural aqueous environment onto blue LED chips. The aqueous integration preserved quantum yield levels of the proteins above 70% in the device architecture and facilitated a high luminous efficiency (LE) of 81 lm W−1 with a color rendering index (CRI) of 83, which is the most efficient eco-friendly white LED reported to date. Moreover, the concentration ratio are also optimized of red- and green-emitting proteins and white protein-based LEDs with a maximum CRI of 92 are demonstrated. This study shows that fluorescent proteins hold great promise for the next generation eco-friendly, efficient and high-quality white light sources.
