効率的な発光装置のための安定で高発光するメチルアモニウム鉛ハリドナノ結晶の簡単な合成
Yasser Hassan1, Olivia J Ashton1, Jong Hyun Park2
1Clarendon Laboratory, Department of Physics , University of Oxford , Parks Road , Oxford OX1 3PU , United Kingdom.
Journal of the American Chemical Society
|January 4, 2019
まとめ
研究者らは,発光ダイオード (LED) 用の安定した高発光メチラモニウム鉛三イオイドペロブスキートナノ結晶を開発した. この画期的な技術により 赤い色と青色の光が 放出されることが可能になり,これはフルカラーディスプレイや 先進的な照明アプリケーションにおいて 極めて重要です.
科学分野:
- 材料科学
- ナノテクノロジー
- 固体物理学
背景:
- メタルハリドペロブスキットは,調節可能な色と高い発光性により,発光ダイオード (LED) の有望性を示しています.
- 現在の赤と青のペロブスキットエミーターは,緑と赤外線と比較して外部量子効率 (EQE) に遅れがあります.
研究 の 目的:
- 安定した,高度に発光するメチルアモニウム鉛トリヨイド (CH3NH3PbI3) のペロブスキートナノ結晶を合成する.
- 赤と青の発光ダイオード (LED) の調節可能な放出を実現するために.
主な方法:
- アセトニトリル/メチラミン溶媒とトルーエンの抗溶媒を用いたリプレシピテーション技術.
- チューニングリガンドの比率,リガンドとトルーエンの比率,そして結晶化のためのトルーエンの温度.
- ブロミド塩と混ぜて赤色にします
主要な成果:
- 合成された立方体CH3NH3PbI3のペロブスキートナノ結晶で,光発光量子産量は93%を超える.
- 660〜705nmの範囲で調節可能な放出と635nmで赤の放出を達成した.
- 最大EQE2.75%のペロブスキートベースのLEDを開発した.
結論:
- 安定した高放射性ペロブスキートナノ結晶は,制御された合成で得られます.
- この方法は,フルカラーディスプレイとホワイトLEDの効率的な赤と青のエミーターの開発を進めます.
- 更に最適化すれば,ペロブスキートベースの発光装置の性能が向上する可能性がある.
さらに関連する動画
関連する概念動画
02:45Alkyl Halides
19.9K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
19.9K
01:59Lagging Strand Synthesis
61.3K
During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
61.3K
02:16Light Acquisition
9.6K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
9.6K
01:12Acid Halides to Esters: Alcoholysis
4.0K
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
4.0K
02:12The Wave Nature of Light
61.3K
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.
61.3K
01:15Dehydration Synthesis
149.6K
Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
149.6K