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Related Concept Videos

Colloids03:22

Colloids

21.3K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Zener Diodes01:16

Zener Diodes

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Zener diodes are specialized semiconductor devices designed to operate in the reverse breakdown region, where they allow current to flow into the cathode, making it positive relative to the anode. This reverse operation distinguishes Zener diodes from conventional diodes and enables their use in various applications, most notably as voltage regulators. One of the defining characteristics of Zener diodes is their nearly vertical I-V (current-voltage) characteristic curve above a certain...
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Colloidal precipitates01:09

Colloidal precipitates

6.5K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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The Wave Nature of Light02:12

The Wave Nature of Light

61.6K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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The Ideal Diode01:15

The Ideal Diode

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A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Highly Efficient Visible Colloidal Lead-Halide Perovskite Nanocrystal Light-Emitting Diodes.

Fei Yan, Jun Xing1, Guichuan Xing2

  • 1Department of Electrical and Computer Engineering , University of Toronto , 10 King's College Road , Toronto , Ontario M5S 3G4 , Canada.

Nano Letters
|April 3, 2018
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Summary

High-efficiency perovskite nanocrystal (PeNC) light-emitting diodes (PeLEDs) achieve 12.9% external quantum efficiency. These PeNCs offer promising advancements for next-generation LED lighting and displays.

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Colloidal nanocrystallead-halide perovskitelight-emitting diodes

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Lead-halide perovskites are explored for solid-state lighting, with perovskite light-emitting diodes (PeLEDs) rapidly advancing.
  • Current PeLED performance is limited by device shortcomings, hindering widespread lighting applications.

Purpose of the Study:

  • To develop high-efficiency PeLEDs using colloidal perovskite nanocrystals (PeNCs).
  • To address limitations in luminous efficiency and emission quenching in PeLEDs.

Main Methods:

  • Synthesized colloidal perovskite nanocrystals (PeNCs) at room temperature.
  • Engineered PeLEDs to achieve charge balance in the recombination zone.
  • Investigated radiative and nonradiative recombination processes.

Main Results:

  • Achieved dominant first-order excitonic radiation with 71% photoluminescence quantum yield in solid films.
  • Suppressed Auger nonradiative recombination at low current densities by balancing charges.
  • Demonstrated maximum external quantum efficiency of 12.9% and power efficiency of 30.3 lm W⁻¹ at >1000 cd m⁻² luminance.

Conclusions:

  • Room-temperature synthesized PeNCs enable high-efficiency PeLEDs with superior radiative properties compared to bulk perovskites.
  • Effective suppression of Auger recombination and charge balance lead to significant performance improvements.
  • PeNCs demonstrate feasible device performance, holding great promise for LED lighting and display applications.