明るい二色放射を持つ無鉛直帯のダブルペロブスキートナノ結晶
Bin Yang1, Xin Mao1, Feng Hong1
1University of the Chinese Academy of Sciences , Beijing 100049 , P.R. China.
Journal of the American Chemical Society
|November 20, 2018
まとめ
新しい無鉛の二重ペロブスキートナノ結晶 (NC) は,調整可能なバンドギャップを提供し,直接のバンドギャップNCは優れた光学特性を示しています. これらの進歩は,高性能,無鉛の光電子装置の道を開く.
科学分野:
- 材料科学
- 固体物理学
- ナノテクノロジー
背景:
- 無鉛のダブルペロブスキートナノ結晶 (NC) は,鉛ベースの材料の代替品として登場しています.
- Cs2AgIn_xBi_1-xCl6のバンドギャップのチューニングは,光電子アプリケーションにとって極めて重要です.
研究 の 目的:
- 鉛のない二重ペロブスキートCs2AgIn_xBi_1-xCl6NCを設計し合成する.
- これらのNCの光学特性を調査し,間接的および直接的なバンドギャップ材料を比較する.
主な方法:
- 異なるインジウム濃度のCs2AgIn_xBi_1-xCl6の合成 (x=0から0.9).
- 吸収横断と光発光量子効率 (PLQE) を含む光学特性の特徴付け.
- 密度関数理論 (DFT) 計算,時間解像度光発光 (TRPL) および光発光刺激 (PLE) スペクトロスコピー.
主要な成果:
- NCはインジウムの組成を調整することによって間接から直接のバンドギャップに順調に調整されました.
- 直接のバンドギャップNCは,間接のバンドギャップNCと比較して3倍以上の吸収横断と5倍以上のPLQEを示した.
- 鉛ペロブスキートに匹敵する直帯ギャップNCで36.6%の高いPLQEを達成し,さらに明るいオレンジ色の放射が観察されました.
結論:
- 無鉛直帯隙 Cs2AgIn_xBi_1-xCl6 NCは優れた光学特性を持っています.
- 観測されたオレンジ色の放射は,理論的および実験的データによって支持された,禁止された移行に起因する.
- これらの発見により,高性能で鉛のないペロブスキート光電子装置の開発が可能になった.
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