Effect of ampoule support on the growth of organic benzimidazole single crystals by vertical Bridgman technique for nonlinear optical applications

Abstract

Benzimidazole single crystals were grown using a vertical Bridgman technique with modified ampoule design. The thermal fluctuations during the melt were effectively controlled by the glass ampoule support which was filled with alumina wool in order to maintain a proper temperature gradient throughout the growth process. The unit cell dimensions of the grown crystals were assessed using powder X-ray diffraction technique. Comparative analyses have been carried out for both the crystals which were grown using a conventional ampoule and using the ampoule with support, via high resolution X-ray diffraction and it was found that there was a significant enhancement in crystalline perfection for the crystal which was grown using the ampoule with support. Further, optical transmission and photoluminescence studies on the grown crystals were carried out using UV-vis and photoluminescence spectroscopy and it was observed that there was a noticeable variation in the optical transmission and luminescence results.

Pure organic TPB single crystal for direct X-ray detection

“…Lower cut-off wavelength and higher optical transparency of the crystal are important factors for device fabrication in optical applications. 25 As shown in Fig. 3(a), the TPB single crystal has a high transmittance of up to 85% in the wavelength range of 200–800 nm, which proves that there are very few internal defects in the as-grown crystal.…”

In situ growth of an ethyl p-hydroxybenzoate single crystal by the vertical Bridgman technique: a potential nonlinear optical material for third-harmonic generation

“…These peaks are 677 and 2142 arcseconds, respectively, away from their adjacent peaks. This indicates the presence of structural low-angle boundaries in the grown crystal with tilt angles of 677 and 2142 arcseconds, respectively (Krishna et al, 2016;Bhagavannarayana et al, 2005).…”

Elemental, Optical, and Time-Domain Terahertz Spectroscopy Studies on Methyl p-Hydroxybenzoate Single Crystal for THz Applications

“…The presence of defects can also be examined by using this technique. 16,17 In this case, SEST-grown MPHB single crystal was subjected to light from a xenon lamp to study its photon emission wavelength for a particular excitation energy. The sample was excited with a photon energy of 3.94 eV, and the corresponding emission spectrum recorded.…”