TY - JOUR
T1 - Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule
AU - Kao, Fan Hsuan
AU - Lin, Ku Yen
AU - Jan, Da Jeng
AU - Tang, Shiow Jing
AU - Yang, Chun Chuen
AU - Lin, Chia Her
AU - Yeh, Jui Ming
AU - Chiu, Kuan Cheng
N1 - Funding Information:
This work was financially supported by National Science Council of the Republic of China (Taiwan) .
PY - 2012/10/15
Y1 - 2012/10/15
N2 - 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.
AB - 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.
KW - A1: Crystal structure
KW - A2: Growth from vapor
KW - B1: Organic compounds
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U2 - 10.1016/j.jcrysgro.2012.07.004
DO - 10.1016/j.jcrysgro.2012.07.004
M3 - Article
AN - SCOPUS:84864526886
SN - 0022-0248
VL - 357
SP - 9
EP - 14
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -