56 research outputs found
Colloidal quantum dot hybrids: an emerging class of materials for ambient lighting
The rapid growth of the global economy and urbanization have resulted in major worldwide issues such as greenhouse gas emission, air pollution and the energy crisis. Artificial ambient light is one of the greatest inventions in human history, but it is also one of the primary energy consumption constituents and a focus of the global grand energy challenge. Therefore, low cost and low energy consumption lighting technology is in high demand. In this review, we will summarise and discuss one of the emerging lighting technologies – white electroluminescence light-emitting diodes enabled by hybrid colloidal quantum dots (WQLEDs), which have attracted intense attention because of promising potential in both flat-panel backlighting and solid-state lighting. WQLEDs have unique high luminescence efficiency, broad colour tunability and solution processability. Over the past few decades, the development of colloidal quantum dot synthesis, material engineering and device architecture has highlighted the tremendous improvements in WQLED formation. As WQLED efficiencies approach those of molecular organic LEDs, we identify the critical scientific and technological challenges and provide an outlook for ongoing strategies to overcome these challenges
Roadmap on Perovskite Light-Emitting Diodes
In recent years, the field of metal-halide perovskite emitters has rapidly
emerged as a new community in solid-state lighting. Their exceptional
optoelectronic properties have contributed to the rapid rise in external
quantum efficiencies (EQEs) in perovskite light-emitting diodes (PeLEDs) from
<1% (in 2014) to approaching 30% (in 2023) across a wide range of wavelengths.
However, several challenges still hinder their commercialization, including the
relatively low EQEs of blue/white devices, limited EQEs in large-area devices,
poor device stability, as well as the toxicity of the easily accessible lead
components and the solvents used in the synthesis and processing of PeLEDs.
This roadmap addresses the current and future challenges in PeLEDs across
fundamental and applied research areas, by sharing the community's
perspectives. This work will provide the field with practical guidelines to
advance PeLED development and facilitate more rapid commercialization.Comment: 103 pages, 29 figures. This is the version of the article before peer
review or editing, as submitted by an author to Journal of Physics:
Photonics. IOP Publishing Ltd is not responsible for any errors or omissions
in this version of the manuscript or any version derived from i
Roadmap on holography
From its inception holography has proven an extremely productive and attractive area of research. While specific technical applications give rise to 'hot topics', and three-dimensional (3D) visualisation comes in and out of fashion, the core principals involved continue to lead to exciting innovations in a wide range of areas. We humbly submit that it is impossible, in any journal document of this type, to fully reflect current and potential activity; however, our valiant contributors have produced a series of documents that go no small way to neatly capture progress across a wide range of core activities. As editors we have attempted to spread our net wide in order to illustrate the breadth of international activity. In relation to this we believe we have been at least partially successful.This work was supported by Ministerio de EconomĂa, Industria y Competitividad (Spain) under projects FIS2017-82919-R (MINECO/AEI/FEDER, UE) and FIS2015-66570-P (MINECO/FEDER), and by Generalitat Valenciana (Spain) under project PROMETEO II/2015/015
A general methodology to measure the light-to-heat conversion efficiency of solid materials
Abstract Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials
From Large-Scale Synthesis to Lighting Device Applications of Ternary I–III–VI Semiconductor Nanocrystals: Inspiring Greener Material Emitters
From Large-Scale Synthesis to Lighting Device Applications of Ternary I–III–VI Semiconductor Nanocrystals: Inspiring Greener Material Emitters
Quantum dots with
fabulous size-dependent and color-tunable emissions
remained as one of the most exciting inventories in nanomaterials
for the last 3 decades. Even though a large number of such dot nanocrystals
were developed, CdSe still remained as unbeatable and highly trusted
lighting nanocrystals. Beyond these, the ternary I–III–VI
family of nanocrystals emerged as the most widely accepted greener
materials with efficient emissions tunable in visible as well as NIR
spectral windows. These bring the high possibility of their implementation
as lighting materials acceptable to the community and also to the
environment. Keeping these in mind, in this Perspective, the latest
developments of ternary I–III–VI nanocrystals from their
large-scale synthesis to device applications are presented. Incorporating
ZnS, tuning the composition, mixing with other nanocrystals, and doping
with Mn ions, light-emitting devices of single color as well as for
generating white light emissions are also discussed. In addition,
the future prospects of these materials in lighting applications are
also proposed
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