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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

25.4K
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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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

36.0K
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.
36.0K
Nuclear Stability03:18

Nuclear Stability

23.4K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
23.4K
Zener Diodes01:16

Zener Diodes

1.3K
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...
1.3K
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

9.8K
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
9.8K
Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

1.6K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
1.6K

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Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Efficient Solution-Processed Nanoplatelet-Based Light-Emitting Diodes with High Operational Stability in Air.

Umberto Giovanella1, Mariacecilia Pasini1, Monica Lorenzon2

  • 1Istituto per lo Studio delle Macromolecole , Consiglio Nazionale delle Ricerche (ISMac-CNR) , Via Bassini 15 , 20133 Milano , Italy.

Nano Letters
|May 4, 2018
PubMed
Summary

Researchers developed new red-emitting colloidal nanoplatelet (NPL) light-emitting diodes (LEDs) with record-breaking efficiency and stability. This breakthrough utilizes a novel charge-regulating polymer layer, enhancing electron injection for brighter, purer red light.

Keywords:
CdSCdSeNanocrystal quantum dotscharge-injecting layerslight-emitting diodesnanoplateletspolar polymer

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Colloidal nanoplatelets (NPLs) offer efficient, narrow-band luminescence for high-purity color in light-emitting diodes (LEDs).
  • Existing NPL-LEDs, especially red-emitting ones, suffer from low external quantum efficiencies (EQEs) compared to devices using spherical nanocrystals.
  • The best reported EQE for red NPL-LEDs is 0.63%, significantly limiting their practical application.

Purpose of the Study:

  • To overcome the efficiency limitations of red-emitting NPL-LEDs.
  • To introduce a novel charge-regulating layer to enhance electron injection and device performance.
  • To achieve ultrahigh color purity and operational stability in solution-processed NPL-LEDs.

Main Methods:

  • Engineered a polar, polyelectrolytic polymer with complementary trimethylammonium and phosphonate functionalities.
  • Incorporated this polymer as a charge-regulating layer between the NPL active layer and the metal cathode.
  • Fabricated completely solution-processed NPL-LEDs utilizing this new interlayer.

Main Results:

  • Achieved an external quantum efficiency (EQE) of 5.73% at 658 nm with 98% color saturation in solution-processed LEDs.
  • Observed an increase in EQE to 8.39% upon exposure to air, exceeding previous red NPL-LED records by over an order of magnitude.
  • Demonstrated near-unity internal quantum efficiency, considering the NPLs' emission quantum yield of 40 ± 5%.
  • Showcased exceptional operational stability with over 5 hours of continuous drive in air without encapsulation.

Conclusions:

  • The developed charge-regulating polymer layer significantly enhances electron injection and performance in NPL-LEDs.
  • The new approach sets a global record for quantum-dot LEDs, particularly for solution-deposited organic interlayers.
  • The findings highlight the potential of NPLs for creating efficient, stable, and saturated red LEDs through solution processing.