Correlation between Crystal Habit and Luminescence Properties of 4,4-Difluoro-1,3-dimethyl-4-bora-3a,4a-diaza-s-indacene, An Asymmetric BODIPY Dye

Correlation between Crystal Habit and Luminescence Properties of 4,4-Difluoro-1,3-dimethyl-4-bora-3a,4a-diaza-s-indacene, An Asymmetric BODIPY Dye
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不对称 BODIPY 染料 4,4-二氟-1,3-二甲基-4-bora-3a,4a-二氮杂-s-indacene 晶体习性与发光性质的相关性

DOI:
10.1021/jp404855s
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发表时间:
2013
影响因子:
3.7
通讯作者:
G. Jung
G. Jung
中科院分区:
化学3区
文献类型:
--
作者:
C. Spies;A.-M. Huynh;V. Huch;G. Jung

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不对称取代的BODIPY染料4,4-二氟-1,3-二甲基-4-硼杂-3a,4a-二氮杂-s-引达省以三种不同的晶体习性结晶,即,针状(I)、叶状(II)或微晶升华晶体(III)。所有晶体都具有相同的晶体结构,但表现出从黄橙色到深红色的不同固态荧光。晶体结构主要由J聚集体的一维链组成,这导致在λ = 600 nm处的激子发光。用点偶极近似计算了激子分裂为3300 cm-1,与实验结果符合得很好.的宏观外观上的发光性能的影响进行了讨论,在表面的反射率和材料内的重吸收。结果表明,由于染料的小斯托克斯位移,长程有序调制固态发光。
The asymmetric substituted BODIPY dye 4,4-difluoro-1,3-dimethyl-4-bora-3a,4a-diaza-s-indacene crystallizes in three different crystal habits, that is, as needles (I), leaves (II), or microcrystalline sublimed crystals (III). All crystals share the same crystal structure but exhibit varying solid-state fluorescence from yellow-orange to deep red. The crystal structure mainly consists of one-dimensional chains of J-aggregates which leads to excitonic luminescence at λ = 600 nm. The point-dipole approximation is used to calculate the excitonic splitting to a value of 3300 cm–1, which is in good agreement with the experimental observations. The influence of the macroscopic appearance on the luminescence properties is discussed in terms of reflectivity of the surface and reabsorption within the material. It turns out that the long-range order modulates the solid-state luminescence due to the small Stokes shift of the dye.
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