Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule

Fan Hsuan Kao, Ku Yen Lin, Da Jeng Jan, Shiow Jing Tang, Chun Chuen Yang, Chia Her Lin, Jui Ming Yeh, Kuan Cheng Chiu

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4 Scopus citations


By choosing various crystalline forms of tris(8-hydroxyquinoline)-aluminum (Alq 3) source powders and using different transport gases under various inside-pressures p in, two constitutional supersaturation (CSS) zones were observed in a vapor transport ampoule with a source temperature of 300 °C and a growth period of 5.0 h. From UV-visible spectra, the material in the lower CSS zone (with sidewall temperature T side≅ 130-270 °C) was the re-condensed Alq 3, while that in the upper zone (T side around room temperature) was the decomposed 8-hydroxyquinoline (8Hq). With increasing p in from 1.3×10 2 to 9.3×10 4 Pa, the decomposition of Alq 3 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 Alq 3 CSS zone on the initial phase of the source powder was observed and discussed.

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalJournal of Crystal Growth
Issue number1
StatePublished - 15 Oct 2012


  • A1: Crystal structure
  • A2: Growth from vapor
  • B1: Organic compounds


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