用含时密度泛函方法研究和设计推拉结构的荧光分子

doi:10.3866/PKU.WHXB201204092

物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1337-1346.doi: 10.3866/PKU.WHXB201204092

用含时密度泛函方法研究和设计推拉结构的荧光分子

刘小君^1,2, 林涛¹, 高少伟¹, 马睿¹, 张晋悦¹, 蔡新晨¹, 杨磊¹, 滕枫¹

1. 北京交通大学光电子技术研究所, 发光与光信息技术教育部重点实验室, 北京 100044;
2. 中国科学院理化技术研究所, 光化学转换与功能材料重点实验室, 北京 100190

收稿日期:2012-02-14 修回日期:2012-04-09 发布日期:2012-05-17
通讯作者: 刘小君 E-mail:xjliu@bjtu.edu.cn
基金资助:
国家自然科学基金(21003009), 北京交通大学(2009JBZ019-4, 本科生创新实验项目), 中国科学院理化技术研究所光化学转换与功能材料重点实验室资助

TDDFT Investigation and Design for Fluorescent Molecules with Push-Pull Structures

LIU Xiao-Jun^1,2, LIN Tao¹, GAO Shao-Wei¹, MA Rui¹, ZHANG Jin-Yue¹, CAI Xin-Chen¹, YANG Lei¹, TENG Feng¹

1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, P. R. China;
2. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received:2012-02-14 Revised:2012-04-09 Published:2012-05-17
Contact: LIU Xiao-Jun E-mail:xjliu@bjtu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21003009), Beijing Jiaotong University, China (2009JBZ019-4 and Undergraduates Innovating Experimentation Project), and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences.

摘要/Abstract

摘要： 应用密度泛函理论(DFT)和含时密度泛函理论(TDDFT)方法及连续极化模型研究了六种荧光材料分子基态和第一激发态的电子结构性质. 这六种分子是: 3-(二氰亚甲基)-5,5-二甲基-1-(3-[9-(2-乙基-己基)-咔唑基]-乙烯基)环己烷(DCDHCC), DCDHCC2, 3-(二氰亚甲基)-5,5-二甲基-1-(4-二苯基氨基-苯乙烯基)环己烷(DCDPC), DCDPC2, 3-(二氰亚甲基)-5,5-二甲基-1-(4-[9-咔唑基]-乙烯基)环己烷(DCDCC)和3-(二氰亚甲基)-5,5-二甲基-1-(4-二甲基氨基-苯乙烯基)环己烷(DCDDC). 它们可作为有机发光显示器件的发光材料. 比较了PBE0、M06、BMK、M062X和CAM-B3LYP五种泛函, 其中BMK方法很好地再现了各个分子在丙酮溶剂中的吸收和发射光谱. 同时计算了分子的电子亲和能和电离势并用于评价分子的电荷注入性质. 研究表明, 当使用双π桥和双受体时, 分子的发射光谱会红移到理想的发光区域. 据此设计了两个新的分子DCDCC2 和DCDDC2,它们分别是DCDCC和DCDDC的双支对应分子. 计算结果表明这两个分子也具有作为荧光发射体的良好性质.

关键词: 密度泛函理论, 含时密度泛函理论, 连续极化模型, 荧光分子, 分子设计

Abstract: The electronic and geometrical structures of the ground and excited states of six fluorescent emitters, namely 3-(dicyanomethylene)-5,5-dimethyl-1-(3-[9-(2-ethyl-hexyl)-carbazol]-vinyl) cyclohexene (DCDHCC), DCDHCC2, 3-(dicyanomethylene)-5,5-dimethyl-1(4-diphenylamino-styryl) cyclohexene (DCDPC), DCDPC2, 3-(dicyanomethylene)-5,5-dimethyl-1-(4-[9-carbazol]-styryl)cyclohexene (DCDCC), and 3-(dicyanomethylene)-5,5-dimethyl-1-(4-dimethylamino-styryl)cyclohexene (DCDDC) which were specifically designed for organic light-emitting diodes (OLEDs), were studied using density functional theory (DFT) and time-dependent DFT (TDDFT) in conjunction with polarizable continuum models (PCMs). Five hybrid functionals, PBE0, M06, BMK, M062X, and CAM-B3LYP, were used and compared. The experimental spectra of the molecules in acetone solvent were precisely reproduced with the BMK functional. The ionization potential and the electron affinity were calculated to access the properties of the molecules in charge injection. It was found that, when double π-bridges and acceptors were used, the emission of emitters red-shifted to the optimal emitting region. Two brand new molecules, DCDCC2 and DCDDC2, which are the double-branched counterparts of DCDCC and DCDDC, respectively, have been designed. The calculated properties of DCDCC2 and DCDDC2 in spectra and charge injection suggested that they would be as effective in their capacities as fluorescent emitters as the above six emitters.

Key words: Density functional theory, Time-dependent density functional theory, Polarizable continuum model, Fluorescent molecule, Molecular design

MSC2000:

O641

刘小君, 林涛, 高少伟, 马睿, 张晋悦, 蔡新晨, 杨磊, 滕枫. 用含时密度泛函方法研究和设计推拉结构的荧光分子[J]. 物理化学学报, 2012, 28(06): 1337-1346.

LIU Xiao-Jun, LIN Tao, GAO Shao-Wei, MA Rui, ZHANG Jin-Yue, CAI Xin-Chen, YANG Lei, TENG Feng. TDDFT Investigation and Design for Fluorescent Molecules with Push-Pull Structures[J]. Acta Phys. -Chim. Sin., 2012, 28(06): 1337-1346.

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用含时密度泛函方法研究和设计推拉结构的荧光分子

TDDFT Investigation and Design for Fluorescent Molecules with Push-Pull Structures

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