Ultrafast Photoluminescence Dynamics of Organic Photosensitizers with Conjugated Linkers Containing Different Heteroatoms

Citation: LIU Jiao, HUO Jicun, ZHANG Min, DONG Xiandui. Ultrafast Photoluminescence Dynamics of Organic Photosensitizers with Conjugated Linkers Containing Different Heteroatoms[J]. Acta Physico-Chimica Sinica, 2018, 34(4): 424-436. doi: 10.3866/PKU.WHXB201709082 shu

含不同杂原子共轭单元的有机光敏染料的超快发光动力学

刘娇 ^1,3, ,
霍继存 ^1,3, ,
张敏 ^{2,
,} ,
董献堆 ^{1,
,}

1.
中国科学院长春应用化学研究所，长春 130022
2.
天津理工大学新能源材料与低碳技术研究院，天津 300384
3.
中国科学院大学，北京 100049

通讯作者: 张敏, zm2016@email.tjut.edu.cn
董献堆, dxd@ciac.ac.cn

基金项目:
国家自然科学基金 51473158

国家自然科学基金 91233206

国家自然科学基金(51473158, 91233206)资助项目

摘要: 系统研究了含有不同杂原子的共轭单元(联呋喃、联噻吩及联硒酚)的三种有机染料C210、C214和C216的超快发光动力学，双己氧基取代的三苯胺作为电子给体，氰基丙烯酸作为电子受体。详细考察了三种染料分别在不同媒介中的激发态动力学：四氢呋喃及甲苯溶液、聚甲基丙烯酸甲酯及聚苯乙烯聚合物薄膜、氧化铝及二氧化钛薄膜表面。发现在以上介质中都普遍存在动态斯托克斯位移现象，表明发生了非平衡激发态的分子内多步弛豫过程。由于扭转弛豫和电子注入过程之间的竞争作用，非平衡激发态的电子注入产率比平衡激发态的低得多。此外，由于激发态能量弛豫导致的能量损失，电子注入时间常数变化超过了一个数量级，这在未来的染料设计及器件发展中应进行控制。三种染料在平衡激发态处的电子注入效率相近，由于C210和C216加快的电子注入速率补足了它们较C214小的平衡激发态寿命。

关键词:

English

Ultrafast Photoluminescence Dynamics of Organic Photosensitizers with Conjugated Linkers Containing Different Heteroatoms

LIU Jiao ^1,3, ,
HUO Jicun ^1,3, ,
ZHANG Min ^{2,
,} ,
DONG Xiandui ^{1,
,}

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
2.
Institute of New Energy Materials & Low-Carbon Technologies, Tianjin University of Technology, Tianjin 300384, P. R. China
3.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Corresponding author: ZHANG Min, zm2016@email.tjut.edu.cn DONG Xiandui, dxd@ciac.ac.cn

Received Date: 15 August 2017
Accepted Date: 04 September 2017
Revised Date: 04 September 2017
Available Online: 15 April 2018
Fund Project:

The project was supported by the National Science Foundation of China (51473158, 91233206)

Abstract: The ultrafast photoluminescence dynamics of three organic dyes—C210, C214, and C216—with different conjugated linkers containing various heteroatoms, such as bifuran, bithiophene and biselenophene, in combination with dihexyloxy-substituted triphenylamine (TPA) as the electron donor and cyanoacrylic acid (CA) as the electron acceptor have been studied systematically. The excited-state dynamics of the three dyes were investigated in detail in different media: tetrahydrofuran (THF) and toluene (PhMe) solutions, polymethyl methacrylate (PMMA) and polystyrene (PS) polymer films, and the surfaces of alumina and titania films in contact with an ionic liquid composite electrolyte. These dyes were found to feature dynamic Stokes shifts in all the aforementioned media, indicating stepwise intramolecular relaxations of the non-equilibrium excited state. The electron injection yield was distinctly lower for the non-equilibrium excited state than the equilibrium excited states, which can be ascribed to the competition between torsional relaxation and electron injection. A broad time scale over one magnitude of order was presented for electron injection due to the great energy losses originating from the multiple torsional relaxations, which should be controlled for future dye design and device development. Moreover, despite the shorter lifetimes of the equilibrium excited states for C210 and C216 than C214, the electron injection yields of equilibrium excited states for all the dyes are comparable due to the accelerated electron injection rate.

Key words:

Solar cells
/ Excited-state dynamics
/ Organic dyes
/ Ultrafast spectroscopy
/ Femtosecond fluorescence up-conversion

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

含不同杂原子共轭单元的有机光敏染料的超快发光动力学

通讯作者: 张敏, zm2016@email.tjut.edu.cn
董献堆, dxd@ciac.ac.cn

English

Ultrafast Photoluminescence Dynamics of Organic Photosensitizers with Conjugated Linkers Containing Different Heteroatoms

Corresponding author: ZHANG Min, zm2016@email.tjut.edu.cn DONG Xiandui, dxd@ciac.ac.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

含不同杂原子共轭单元的有机光敏染料的超快发光动力学

通讯作者: 张敏, zm2016@email.tjut.edu.cn 董献堆, dxd@ciac.ac.cn

English

Ultrafast Photoluminescence Dynamics of Organic Photosensitizers with Conjugated Linkers Containing Different Heteroatoms

Corresponding author: ZHANG Min, zm2016@email.tjut.edu.cn DONG Xiandui, dxd@ciac.ac.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

通讯作者: 张敏, zm2016@email.tjut.edu.cn
董献堆, dxd@ciac.ac.cn

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs