摘要： By choosing various crystalline forms of tris(8-hydroxyquinoline)-aluminum (Alq3) source powders and using different transport gases under various inside-pressures pin, two constitutional supersaturation (CSS) zones were observed in a vapor transport ampoule with a source temperature of 300°C and a growth period of 5.0h. From UV–visible spectra, the material in the lower CSS zone (with sidewall temperature Tside≅130–270°C) was the re-condensed Alq3, while that in the upper zone (Tside around room temperature) was the decomposed 8-hydroxyquinoline (8Hq). With increasing pin from 1.3×102 to 9.3×104Pa, the decomposition of Alq3 into 8Hq was enhanced, and the deposition of 8Hq CSS zone became apparent with the formation of several 8Hq needle crystals. In addition, a dependence of the crystal structure formed in the Alq3 CSS zone on the initial phase of the source powder was observed and discussed. ► Constitutional supersaturation in a vapor transport ampoule was studied. ► Re-condensation and decomposition of Alq3 and formation of 8Hq needle crystals were discussed. ► This study is related to problems about Alq3-based OLEDs and organic crystal growth behaviors. 出版者： Amsterdam: Elsevier B.V 出版日期： 2012-10-15 出處： Journal of crystal growth, 2012-10, Vol.357 (C), p.9-14 版權： 2012 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0022-0248 識別號： EISSN: 1873-5002 識別號： DOI: 10.1016/j.jcrysgro.2012.07.004 識別號： CODEN: JCRGAE
