Polarised Optical Emission from Organic Anisotropic Microoptical Waveguides Grown by Ambient Pressure Vapour‐deposition

Abstract

Ambient pressure chemical vapour deposition of 5,5′‐bis((2‐(trifluoromethyl)phenyl)ethynyl)‐2,2′‐bithiophene provides ultrapure needle‐shaped crystals. The crystal‘s supramolecular structure consists of an array of hydrogen bonds and π‐π interactions leading to anisotropic arrangements. The cyan emitting crystals exhibit an optical waveguiding tendency with guided polarised optical emissions due to anisotropic molecular arrangements.

Rational Design of a Multifunctional Benzothiadiazole Derivative in Organic Photonics and Electronics

“…The calculation of the OLC was carried out through the equation I=I 0 e À αx , where I is the PL intensity in the output, I 0 in the input, x is the propagation distance in the crystal and α the parameter to determinate in μm À 1 (Figure 7b). After conversion α to dB μm À 1 (by using the relation α (dB μm À 1 ) = 4.34 α (μm À 1 )), the value calculated for OLC is 1.13×10 À 2 dB μm À 1 , that is in the order of the best derivatives reported, [38][39][40] corroborating the good efficiency of this optical waveguide.…”

New insights into structure/optical waveguide behavior relationships in linear bisethynylbenzenes

“…The analysis of these crystalline aggregates confirms that the crystals with porous structures and internal channels showed waveguiding activity (Fig. S9-S12, ESI †) 43,44,48,49 while the crystals without internal channels and with compact structures do not behave as optical waveguides (Fig. S13, ESI †).…”

“…For this purpose, methoxy and CF 3 groups have been introduced at different positions of the carbon backbone, since in previous studies by our research group they have shown a great ability to form supramolecular aggregates. 43–46,49…”

“…Thus, encouraged by the need to deepen the knowledge of the relationship between the crystal structure and waveguide properties and based on our previous experience in this field, [42][43][44][45][46][47][48][49] this paper reports the synthesis, aggregate formation and study of the crystal structure and waveguide properties of a series of 1,4-bis(phenylethynyl)benzene derivatives (Fig. 1).…”

“…For this purpose, methoxy and CF 3 groups have been introduced at different positions of the carbon backbone, since in previous studies by our research group they have shown a great ability to form supramolecular aggregates. [43][44][45][46]49 Our main propose is to find a first approach for the establishment of a relationship between the optical waveguiding behavior and the crystalline structure through X-ray diffraction, opening the path for us as a predictive tool in the design of future organic optical waveguides for the construction of new photonic chips.…”