Journal ArticleDOI
Tuning shades of white light with multi-color quantum-dot-quantum-well emitters based on onion-like CdSe-ZnS heteronanocrystals.
Hilmi Volkan Demir,Sedat Nizamoglu,Evren Mutlugun,Tuncay Ozel,Sameer Sapra,Nikolai Gaponik,Alexander Eychmüller +6 more
TLDR
The modification of in-film emission from these multi-layered heteronanocrystals with respect to their in-solution emission, which plays a significant role in hybrid LED applications is investigated.Abstract:
We present white light generation controlled and tuned by multi-color quantum-dot–quantum-well emitters made of onion-like CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light-emitting diodes (LEDs). We demonstrate hybrid white LEDs with (x, y) tristimulus coordinates tuned from (0.26, 0.33) to (0.37, 0.36) and correlated color temperatures from 27 413 to 4192 K by controlling the number of their integrated red–green-emitting heteronanocrystals. We investigate the modification of in-film emission from these multi-layered heteronanocrystals with respect to their in-solution emission, which plays a significant role in hybrid LED applications. Our proof-of-principle experiments indicate that these complex heteronanocrystals hold promise for use as nanoluminophors in future hybrid white LEDs.read more
Citations
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Journal ArticleDOI
Strongly Fluorescent Quaternary Cu-In-Zn-S Nanocrystals Prepared from Cu1-xInS2 Nanocrystals by Partial Cation Exchange
Luca De Trizio,Luca De Trizio,Mirko Prato,Alessandro Genovese,Alberto Casu,Mauro Povia,Roberto Simonutti,Marcelo J. P. Alcocer,Marcelo J. P. Alcocer,Cosimo D'Andrea,Cosimo D'Andrea,Francesco Tassone,Liberato Manna +12 more
TL;DR: In this article, a high-yield, low-cost synthesis route to colloidal colloidal Cu1-xInS2 nanocrystals with a tunable amount of Cu vacancies in the crystal lattice was reported.
Journal ArticleDOI
Semiconductor-nanocrystals-based white light-emitting diodes.
TL;DR: In this review, the recent progress in semiconductor-nanocrystals-based WLEDs is highlighted, the different approaches for generating white light are compared, and the benefits and challenges of the solid-state lighting technology are discussed.
Journal ArticleDOI
Bright white-light emitting manganese and copper co-doped ZnSe quantum dots.
TL;DR: It is of great importance for many applications to find high-quality single source white-light emitters through low-cost chemical synthesis approaches that will allow the production of white light while meeting the needs of industry, such as satisfactory Commission International d Eclairage (CIE) coordinates.
Journal ArticleDOI
Excitonics of semiconductor quantum dots and wires for lighting and displays
Burak Guzelturk,Burak Guzelturk,Pedro Ludwig Hernandez Martinez,Pedro Ludwig Hernandez Martinez,Qing Zhang,Qihua Xiong,Handong Sun,Xiao Wei Sun,Alexander O. Govorov,Hilmi Volkan Demir,Hilmi Volkan Demir +10 more
TL;DR: In this paper, a review of the excitonics of quantum dot and wire emitters is presented, focusing on the transfer of excitons in the complex media of the quantum dots and wires.
Journal ArticleDOI
Simultaneous Type-I/Type-II Emission from CdSe/CdS/ZnSe Nano-Heterostructures
Udit Soni,Anuushka Pal,Sajan Singh,Mona Mittal,Sushma Yadav,Ravikrishnan Elangovan,Sameer Sapra +6 more
TL;DR: A unique C/I/S structure composed of CdSe/CdS/ZnSe that exhibits both Type-I and Type-II phenomena is reported that is possible to form these two separate excitons in the same system separated by a CdS intermediate layer.
References
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The Blue Laser Diode: GaN based Light Emitters and Lasers
Shuji Nakamura,Gerhard Fasol +1 more
TL;DR: The physics of gallium nitrides and related compounds GaN growth p-Type GaN obtained by electron beam irradiation n-Type GAN p-type GaN InGaN Zn and Si co-doped GaN double-heterostructure blue and blue green LEDs inGaN single-quantum-well structure LEDs room-temperature pulsed operation of laser diodes emission mechanisms of LEDs and LDs room temperature CW operation of InGAN MQW LDs latest results as discussed by the authors.
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Victor I. Klimov,Alexander Mikhailovsky,S. Xu,Anton V. Malko,Jennifer A. Hollingsworth,C. A. Leatherdale,H.-J. Eisler,Moungi G. Bawendi +7 more
TL;DR: In this article, the authors examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombination, large optical gain can be developed at the wavelength of the emitting transition for close-packed solids of these dots.
Journal Article
Optical gain and stimulated emission in nanocrystal quantum dots
Victor I. Klimov,A. A. Mikhallovsky,S. Xu,Anton V. Malko,Jennifer A. Hollingsworth,C. A. Leatherdale,H.-J. Eisler,Moungi G. Bawendi +7 more
TL;DR: This work examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombination, large optical gain can be developed at the wavelength of the emitting transition for close-packed solids of these dots.
Journal ArticleDOI
Air-Stable All-Inorganic Nanocrystal Solar Cells Processed from Solution
Ilan Gur,N. A. Fromer,N. A. Fromer,Michael L. Geier,Michael L. Geier,A. Paul Alivisatos,A. Paul Alivisatos +6 more
TL;DR: An ultrathin donor-acceptor solar cell composed entirely of inorganic nanocrystals spin-cast from solution is introduced, elucidates a class of photovoltaic devices with potential for stable, low-cost power generation.
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Light Emitting Diodes
TL;DR: In this article, the properties of inorganic LEDs, including emission spectra, electrical characteristics, and current-flow patterns, are presented and the packaging of low power and high power LED dies is discussed.