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Investigation of the growth process of organic/inorganic doped aromatic derivates crystals

A. STANCULESCU1,*

Affiliation

  1. National Institute for Materials Physics, 105bis Atomistilor Street, P.O.Box MG 7, 077125 Magurele, Bucharest, Romania

Abstract

This paper presents a study of the thermal regime associated with the experimental configuration used for the growth of doped organic crystals from the melt in Bridgman-Stockbarger configurations. For different systems, host: metadinitrobenzene (m-DNB), benzil/guest: m-DNB, naphthalene, iodine, I have investigated the effect of the changes in the experimental conditions (dopant type and concentration, c=0.5-3 wt %, thermal gradient at the growth interface, ΔT=6-33oC, moving speed of the solid-liquid interface, V=0.7-2.7 mm/h) on the crystals growth process. I have made comparisons between the particularities of the incorporation mechanism of the big acceptor (atom:iodine c=0.5; 1; 2 wt %; molecule: m- DNB and naphthalene c=1.5; 3 wt %) and dopant segregation mechanism, and the transmission properties of different monocomponent crystalline organic matrix (m-DNB and benzil). I have also investigated the influence of the simultaneous presence of two dopants (m-DNB or naphthalene/iodine) in organic benzil matrix and their effect on the optical properties. have evaluated the growth interface stability in our Bridgman-Stockbarger experimental configuration and analysed the conditions for the generation of the morphological instabilities in benzil-dopant system..

Keywords

Organic compounds, Meta-dinitrobenzene, Benzil, Crystals growth, Dopants, UV-VIS Spectroscopy, Morphological instability.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

A. STANCULESCU, Investigation of the growth process of organic/inorganic doped aromatic derivates crystals, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1329-1336 (2007)