From Red to Green Luminescence via Surface Functionalization. Effect of 2-(5-Mercaptothien-2-yl)-8-(thien-2-yl)-5-hexylthieno[3,4-c]pyrrole-4,6-dione Ligands on the Photoluminescence of Alloyed Ag–In–Zn–S Nanocrystals
摘要:
A semiconducting molecule containing a thiol anchor group, namely 2-(5-mercaptothien-2-yl)-8-(thien-2-yl)-5-hexylthieno[3,4-c]pyrrole-4,6-dione (abbreviated as D-A-D-SH), was designed, synthesized, and used as a ligand in nonstoichiometric quaternary nanocrystals of composition Ag1.0In3.1Zn1.0S4.0(S-6.1) to give an inorganic/organic hybrid. Detailed NMR studies indicate that D-A-D-SH ligands are present in two coordination spheres in the organic part of the hybrid: (i) inner in which the ligand molecules form direct bonds with the nanocrystal surface and (ii) outer in which the ligand molecules do not form direct bonds with the inorganic core. Exchange of the initial ligands (stearic acid and 1-aminooctadecane) for D-A-DSH induces a distinct change of the photoluminescence. Efficient red luminescence of nanocrystals capped with initial ligands (lambda(max) = 720 nm, quantum yield = 67%) is totally quenched and green luminescence characteristic of the ligand appears (lambda(max) = 508 nm, quantum yield = 10%). This change of the photoluminescence mechanism can be clarified by a combination of electrochemical and spectroscopic investigations. It can be demonstrated by cyclic voltammetry that new states appear in the hybrid as a consequence of D-A-D-SH binding to the nanocrystals surface. These states are located below the nanocrystal LUMO and above its HOMO, respectively. They are concurrent to deeper donor and acceptor states governing the red luminescence. As a result, energy transfer from the nanocrystal HOMO and LUMO levels to the ligand states takes place, leading to effective quenching of the red luminescence and appearance of the green one.
From-Core and From-End Direct CH Arylations: A Step-Saving New Synthetic Route to Thieno[3,4-<i>c</i>]pyrrole-4,6-dione (TPD)-Incorporated D--π-A-π-D Functional Oligoaryls
作者:Po-Han Lin、Kuan-Ting Liu、Ching-Yuan Liu
DOI:10.1002/chem.201501015
日期:2015.6.8
contrast to the traditional multistep synthesis, herein an efficient and fewer‐steps new synthetic strategy is demonstrated for the facile preparation of organic‐electronically important D–π–A–π–D‐type oligoaryls through sequential direct CH arylations. This methodology has shown that the synthesis of thieno[3,4‐c]pyrrole‐4,6‐dione (TPD)‐ or furano[3,4‐c]pyrrole‐4,6‐dione (FPD)‐centred target molecules
与此相反的传统多步合成,本文中的高效和少数步骤新的合成策略是证明了通过顺序直接C中容易制备的有机电子重要d-π-A-π-d型oligoaryls ħ芳基化。该方法学表明,以噻吩并[3,4- c ]吡咯-4,6-二酮(TPD)或呋喃并[3,4- c ]吡咯-4,6-二酮(FPD)为中心的目标分子的合成可以从核心结构(受体)或末端结构(供体)经济地步入,这为π功能小分子半导体材料的制备提供了更灵活,更简洁的新合成替代品。另外,检查了合成的低聚芳基的光学和电化学性质。
Synthesis and photovoltaic properties of organic sensitizers incorporating a thieno[3,4-c]pyrrole-4,6-dione moiety
作者:Quanyou Feng、Xuefeng Lu、Gang Zhou、Zhong-Sheng Wang
DOI:10.1039/c2cp40872d
日期:——
organic sensitizers containing a thieno[3,4-c]pyrrole-4,6-dione (TPD) moiety with triphenylamine or julolidine as the electron donor have been designed and synthesized for quasi-solid-statedye-sensitizedsolarcells (DSSCs). For comparison, two organic dyes based on a terthiophene spacer have also been synthesized. The absorption, electrochemical and photovoltaic properties of all sensitizers have been
新型有机敏化剂,含有噻吩并[3,4- c ]吡咯-4,6-二酮(TPD)部分,三苯胺 或者 茱ul啶已经设计并合成了作为电子供体的准固态染料敏化太阳能电池(DSSC)。为了比较,还合成了基于对噻吩间隔基的两种有机染料。已经对所有敏化剂的吸收,电化学和光伏性质进行了系统研究。我们发现,加入TPD对拓宽有机增感剂的吸收光谱并防止分子间的相互作用非常有利。因此,降低了电荷复合的可能性,这通过受控强度调制光电压光谱法得以揭示。基于敏化剂FNE38的准固态DSSC 具有TPD和三苯胺部分的化合物在不使用助吸附剂的情况下,在标准AM 1.5G阳光下的太阳能转化效率为4.71%。