Study on energy-transfer in an organic-inorganic material

有机-无机材料中的能量传递研究

• 批准号: 13440100
• 负责人: EMA Kazuhiro
• 金额: $ 8.51万
• 依托单位: Sophia University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440100/
• 关键词: organic-inorganic material; exciton; energy transfer; quantum-well material; Dexter mechanism; low-dimensional material; 有機・無機複合型物質

We investigated energy transfer from excitons to organic materials in an organic-inorganic quantum-well material, (C_4H_9NH_3)_2PbBr_4, which is a layered perovskite-type quantum-well material. It has inorganic well layers composed of two-dimensional network of corner-sharing [PbBr_6]^4 octahedra between organic barrier layers of alkyl ammonium chains. Excitons are tightly confined in the inorganic well layers and have extremely large binding energy (- 400 meV). Strong excitonic photoluminescence (PL) are clearly observed at 3.014 eV. On the other hand, (C_10H_7CnH_<2n+1>NH_3)_2PbBr_4 and (C_10H_7OCnH_<2n+1>NH_3)_2PbBr_4 in which naphthalene molecules are doped into organic barrier layers show little PL from the excitons but show strongly enhanced phosphorescence from the triplet state of naphthalene molecules. The PL excitation measurements have shown that the enhanced phosphorescence is caused by energy transfer from the excitons. We investigated the dynamics of the energy transfer by time-resolved PL measurements using the samples which are controlled the distance between the naphthalene molecules and the excitons.

研究了层状钙钛矿型量子阱材料（C_4H_9NH_3）_2PbBr_4中激子向有机材料的能量传递。它具有由烷基铵链的有机阻挡层之间的[PbBr_6]^4八面体的角共享二维网络组成的无机阱层。激子被紧密地限制在无机阱层中，并且具有极大的结合能（~ 400 meV）。在3.014 eV处清楚地观察到强激子光致发光（PL）。而在（C10 H7 CnH <2n+1> NH3）2 PbBr 4和（C10 H7 OCnH <2n+1> NH3）2 PbBr 4中，萘分子被掺杂到有机势垒层中，激子的光致发光很小，而萘分子的三重态的磷光却有很强的增强。PL激发测量表明，增强的磷光是由激子的能量转移引起的。我们利用时间分辨的光致发光测量研究了萘分子和激子之间距离控制的样品的能量转移动力学。

项目成果

江馬一弘: "有機・無機複合型物質の励起子"パリティ. 16. 12-18 (2001)

Kazuhiro Ema：“有机-无机复合材料中的激子”Parity 16. 12-18 (2001)。

江馬一弘: "無機有機複合型量子井戸構造の励起子"日本物理学会誌. 58. 20-28 (2003)

Kazuhiro Ema：“无机-有机复合量子阱结构中的激子”日本物理学会杂志 58. 20-28 (2003)。

J.Ishi: "Influence of exciton-exciton interactions on frequency-mixing signals in a stable exciton-biexciton system"Phys. Rev. B. 63. 073303 (2001)

J.Ishi：“激子-激子相互作用对稳定激子-双激子系统中混频信号的影响”Phys。

江間一弘: "無機有機複合型量子井戸構造の励起子"日本物理学会誌. 58. 20-28 (2003)

Kazuhiro Ema：“无机-有机复合量子阱结构中的激子”日本物理学会杂志 58. 20-28 (2003)。

K.Ema: "All-optical serial-to-parallel conversion of Tbits/s signals using a four-wave-mixing process"Optical and Quantum Electronics. 33. 1077-1087 (2001)

K.Ema：“使用四波混合过程对 Tbits/s 信号进行全光串行到并行转换”光学和量子电子学。