ホワイトライトエミッティングハイブリッド鉛ブロミドペロフスキットの構造的多様性
Lingling Mao1, Peijun Guo2, Mikaël Kepenekian3
1Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208 , United States.
Journal of the American Chemical Society
|September 14, 2018
まとめ
研究者は,多様な構造を持つ新しいハイブリッド鉛ブロミドペロブスキットを合成し,調節可能なブロードバンド放射を示しました. 1D構造 (2,6dmpz) 3Pb2Br10は,効率的な電荷キャリアの緩解により,12%の光発光量子産出を達成した.
科学分野:
- 材料科学
- 固体化学
- 光電子機器
背景:
- ハリドペロブスキットは,光電子工学にとって有望である.
- 鉛ブロミドと塩化ペロブスキットは,自己捕捉されたエキストン (STEs) から白光放射を示します.
研究 の 目的:
- 多様な構造を持つ新しいハイブリッド鉛ブロミドペロブスキットを合成し,特徴づけること.
- 構造的多様性,電子特性,発光性の関係を調査する.
- これらの材料の光電子応用の可能性を探求する.
主な方法:
- シングルクリスタルX線 difraktion
- 低周波ラマンスペクトル
- 密度関数理論 (DFT) の計算
- 発光スペクトロスコーピー
- 温度に依存する光発光 (PL) 測定
主要な成果:
- 構造的に多様な混合鉛ブロミドペロブスキート (1D,2D,3D) を調節可能なバンドギャップ (2.923.50 eV) で合成した.
- PbBr6八面体の接続性とバンドギャップエネルギーとの相関が観察されました:コーナーシェアリング < エッジシェアリング < 面シェアリング.
- DFTの計算により,電子構造は八面体の接続性に依存していることが明らかになった.
- 化合物間で定常の電流帯エネルギーと変化する電流帯エネルギーを特定した.
- 1D化合物は,自由エクシトンとSTE放射の両方を示し, (2,6dmpz) 3Pb2Br10は,最も高い光発光量子率 (12%) を示した.
結論:
- ハイブリッド鉛ブロミドペロブスキートの構造的多様性は,その光電子特性に大きな影響を与えます.
- (2,6dmpz) 3Pb2Br10の1D構造は,高効率の電荷载体リラックスと高い光発光量子産出を促進する.
- これらの発見は,高度な光電子機器のための新しいペロブスキート材料の設計のための経路を提供します.
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