Highly Fluorescent Emitters Based on Triphenylamine‐π‐Triazine (D‐π‐A) System: Effect of Extended Conjugation on Singlet‐Triplet Energy Gap,Asian Journal of Organic Chemistry

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Highly Fluorescent Emitters Based on Triphenylamine‐π‐Triazine (D‐π‐A) System: Effect of Extended Conjugation on Singlet‐Triplet Energy Gap
Asian Journal of Organic Chemistry ( IF 2.8 ) Pub Date : 2020-05-12 , DOI: 10.1002/ajoc.202000165
Shiv Kumar ₁ , Pachaiyappan Rajamalli _{1,

2} , David B. Cordes ₁ , Alexandra M. Z. Slawin ₁ , Eli Zysman‐Colman ₁

Affiliation

Three D‐π‐A type linearly‐extended emitters, based on diphenylamine (DPA) as the donor and 2,4,6‐triphenyl‐1,3,5‐triazine (TRZ) as the acceptor, were synthesized and their optoelectronic properties characterized. The introduction of an additional phenyl or phenylethynyl π‐spacer results in an enhancement of the molar extinction coefficient and a systematic bathochromic shift of the charge‐transfer transition in the absorption spectra. A mirrored bathochromic shift in the photoluminescence spectra is also observed with increasing conjugation of the bridge moiety. All three compounds show high photoluminescence quantum yields and moderate singlet‐triplet excited state energy gaps, ΔE_ST, of 0.26‐0.37 eV were observed in 10 wt% doped films in PMMA as the host matrix.

中文翻译：

基于三苯胺-π-三嗪（D-π-A）系统的高荧光发射体：扩展共轭对单重态-三重态能隙的影响

合成了以二苯胺（DPA）为供体和2,4,6-三苯基-1,3,5-三嗪（TRZ）为受体的三个D-π-A型线性扩展发射体，并研究了其光电性能表征。引入额外的苯基或苯基乙炔基π-间隔基会导致摩尔消光系数的增加和吸收光谱中电荷转移跃迁的系统性红移。随着桥部分的共轭增加，还观察到了光致发光光谱中的镜像红移。这三种化合物均显示出高的光致发光量子产率和中等的单重态-三重态激发态能隙，ΔE _ST在以PMMA为主体基质的10 wt％的掺杂薄膜中观察到0.26-0.37 eV。

更新日期：2020-05-12

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