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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

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A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
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Solution Formation02:16

Solution Formation

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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Related Experiment Video

Updated: Feb 7, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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All-Solution-Processed Perovskite Quantum Dots Light-Emitting Diodes Based on the Solvent Engineering Strategy.

Kaiyu Yang, Fushan Li, Yang Liu

    ACS Applied Materials & Interfaces
    |July 31, 2018
    PubMed
    Summary

    Researchers developed a simple, scalable method for producing perovskite quantum dots (PeQDs) and fabricating PeQDs-LEDs using an all-solution process. This approach significantly reduces manufacturing costs and complexity for high-performance light-emitting diodes.

    Keywords:
    all solution processlight emitting diodesperovskite quantum dotssolvent engineeringultrasonic

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optoelectronics

    Background:

    • Perovskite quantum dots (PeQDs) are promising nanomaterials for light-emitting diodes (LEDs).
    • Current synthesis and fabrication methods for PeQDs-LEDs are complex, often requiring vacuum processing, which increases cost and hinders mass production.
    • PeQDs films are susceptible to dissolution in common organic solvents, complicating solution-based processing.

    Purpose of the Study:

    • To develop a simplified, scalable synthesis for PeQDs.
    • To establish an all-solution process for fabricating PeQDs-LEDs.
    • To overcome the challenge of PeQDs film dissolution in organic solvents for solution processing.

    Main Methods:

    • A one-step ultrasonic bath treatment was employed for PeQDs synthesis.
    • Solvent engineering, specifically using methyl acetate (MeOAc) for the electron transport layer (ETL), enabled an all-solution fabrication process.
    • PeQDs-LEDs were fabricated and characterized.

    Main Results:

    • The ultrasonic bath method provides a simple and scalable route for PeQDs synthesis.
    • The developed all-solution process successfully fabricated PeQDs-LEDs.
    • The PeQDs-LEDs fabricated using MeOAc for the ETL achieved a maximum current efficiency of 3.26 cd/A, demonstrating bright luminance.

    Conclusions:

    • This work presents a facile and scalable approach for PeQDs synthesis and all-solution processing of PeQDs-LEDs.
    • The solvent engineering strategy effectively addresses the dissolution issue, paving the way for low-cost, mass-producible PeQDs-LEDs.