Quantum dot white LEDs with high luminous efficiency

Sadeghi, Sadra; Kumar, Baskaran Ganesh; Melikov, Rustamzhon; Aria, Mohammad Mohammadi; Jalali, Houman Bahmani; Nizamoğlu, Sedat

doi:10.1364/optica.5.000793

Cited by 107 publications

(89 citation statements)

References 53 publications

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“…To fabricate LEDs capable of incorporating proteins in liquid‐state, we used an encapsulation method, which holds the proteins solution on top of the blue LED chips. [ 11,30,31 ] For that, we designed and cured a hemispherical polydimethylsiloxane (PDMS) polymeric lens with the inner and outer diameters of 7 and 9 mm (Figure 3e‐inset). At the next stage, the cured PDMS lens was placed on top of the LED (Figure 3e), and was fixed by using the UV curable resin and subsequent UV illumination (Figure 3f).…”

Section: Resultsmentioning

confidence: 99%

“…The achieved luminous efficiency level in this study (81 lm W −1 ) is higher than the previous RGB lighting devices using colloidal QDs (Figure 5e). [ 11,19a,21,33 ] The red‐points in Figure 5e showed the LE levels of QDs having toxic heavy metals such as cadmium, lead, etc. However, there are environmental and health concerns on the use of toxic‐heavy‐metal containing devices.…”

Section: Resultsmentioning

confidence: 99%

“…The simulation values for LE and EQE was multiplied by 0.77 based on the previous study. [ 11 ] This multiplication factor was calculated based on the intensity difference between the bare blue chip and the blue chip with hemispheric polymeric lens and water (without fluorescent proteins) when the LED is illuminating with the forward current of 10 mA.…”

Section: Methodsmentioning

confidence: 99%

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Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Sadeghi

Melikov

Conkar

et al. 2020

Adv Materials Technologies

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Sadeghi

Melikov

Conkar

et al. 2020

Adv Materials Technologies

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“…Большой интерес привлекает легирование полупроводников ионам лантаноидов [7,11,[28][29][30][31][32][33][34][35][36][37][38][39][40]. Этот интерес объясняется их оптическими свойствами, возможностью получения изолированных центров свечения в полупроводниковой матрице с интенсивной узкополосной люминесценцией.…”

Section: Introductionunclassified

Фотолюминесценция композиций полиметилметакрилат/(Zn, Cu, Ag)S : Eu-=SUP=-3+-=/SUP=-

Smagin¹,

Затонская²,

Ilina³

et al. 2020

Физика Твердого Тела

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Luminescent nanoscale particles (quantum dots) (Zn,Cu,Ag)S:Eu3+ were synthesized during decomposition of thioacetamide complexes of metals in a methylmethacrylate medium during block polymerization under heating. The formation of quantum dots is confirmed by the corresponding band in the optical absorption spectrum of polymer compositions. Photoluminescence of PMMA/(Zn,Cu,Ag)S:Eu3+ compositions is manifested as a complex band associated with defects in the crystal structure formed when ZnS was doped with copper and silver ions, and a set of narrow bands of luminescence of Eu3+ ions. Luminescence excitation occurs as a result of inter-zone transitions and electron transitions from the valence band to the ZnS defect levels, and self-absorption of energy by Eu3+ ions. The relationship of ions Eu3+ particles of ZnS is confirmed by the dependence of the intensity of the broadband luminescence of ZnS with increasing concentration of ions Eu3+ and an increase in intensity narrow-band luminescence of ions Eu3+ as a result of energy transfer from levels of doped ZnS crystals on the energy levels of the ions Eu3+.

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“…Quantum dots (QDs), including the Cd-, InP-, and perovskite-based QDs, with excellent optical properties have shown great potential in nextgeneration displays owing to their tunable emission wavelength, narrow full width at half maximum (FWHM), high quantum efficiency, and high peak brightness. [1][2][3] Therefore, QD light-emitting diodes (LEDs) have been widely proposed for use in backlight display as they offer the widest color gamut possible and an increased system efficiency. QD-lm 4 and QDon-chip 5 are two types of QDs used for displays.…”

Section: Introductionmentioning

confidence: 99%

High-performance quantum dot light-emitting diodes using chip-scale package structures with high reliability and wide color gamut for backlight displays

et al. 2018

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Quantum dot white LEDs with high luminous efficiency

Cited by 107 publications

References 53 publications

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Ultra‐Efficient and High‐Quality White Light‐Emitting Devices using Fluorescent Proteins in Aqueous Medium

Фотолюминесценция композиций полиметилметакрилат/(Zn, Cu, Ag)S : Eu-=SUP=-3+-=/SUP=-

High-performance quantum dot light-emitting diodes using chip-scale package structures with high reliability and wide color gamut for backlight displays

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