Stokes Shift Dynamics in Ionic Liquids: Temperature Dependence

2010 ◽  
Vol 114 (50) ◽  
pp. 16811-16823 ◽  
Author(s):  
Hemant K. Kashyap ◽  
Ranjit Biswas
Keyword(s):  
Ionic Liquids ◽  
Temperature Dependence ◽  
Stokes Shift ◽  
Shift Dynamics

Dynamic Stokes Shift of 9,9′-Bianthryl in Ionic Liquids: A Temperature Dependence Study

2009 ◽  
Vol 113 (27) ◽  
pp. 11868-11876 ◽  
Author(s):  
Yutaka Nagasawa ◽  
Akito Oishi ◽  
Tsuyoshi Itoh ◽  
Masakazu Yasuda ◽  
Masayasu Muramatsu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Temperature Dependence ◽  
Stokes Shift

scholarly journals Dynamics of Anomalous Temperature-Induced Emission Shift in MOCVD-grown (Al, In)GaN Thin Films

2000 ◽  
Vol 5 (S1) ◽  
pp. 796-802 ◽  
Author(s):  
Yong-Hoon Cho ◽  
G. H. Gainer ◽  
J. B. Lam ◽  
J. J. Song ◽  
W Yang ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Stokes Shift ◽  
Energy Shift ◽  
Peak Position ◽  
Time Resolved ◽  
Temperature Range ◽  
Al Content ◽  
Peak Energy ◽  
Emission Behavior ◽  
Pl Intensity

We present a comprehensive study of the optical characteristics of (Al, In)GaN epilayers measured by photoluminescence (PL), integrated PL intensity, and time-resolved PL spectroscopy. For not only InGaN, but also AlGaN epilayers with large Al content, we observed an anomalous PL temperature dependence: (i) an “S-shaped” PL peak energy shift (decrease-increase-decrease) and (ii) an “inverted S-shaped” full width at half maximum (FWHM) change (increase-decrease-increase) with increasing temperature. Based on time-resolved PL, the S shape (inverted S shape) of the PL peak position (FWHM) as a function of temperature, and the much smaller PL intensity decrease in the temperature range showing the anomalous emission behavior, we conclude that strong localization of carriers occurs in InGaN and even in AlGaN with rather high Al content. We observed that the following increase with increasing Al content in AlGaN epilayers: (i) a Stokes shift between the PL peak energy and the absorption edge, (ii) a redshift of the emission with decay time, (iii) the deviations of the PL peak energy, FWHM, and PL intensity from their typical temperature dependence, and (iv) the corresponding temperature range of the anomalous emission behavior. This indicates that the band-gap fluctuation responsible for these characteristics is due to energy tail states caused by non-random inhomogeneous alloy potential variations enhanced with increasing Al content.

Solubility of fluorinated compounds in a range of ionic liquids. Cloud-point temperature dependence on composition and pressure

2008 ◽  
Vol 10 (9) ◽  
pp. 918 ◽  
Author(s):  
Rui Ferreira ◽  
Marijana Blesic ◽  
Joana Trindade ◽  
Isabel Marrucho ◽  
José N. Canongia Lopes ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Temperature Dependence ◽  
Cloud Point ◽  
Point Temperature ◽  
Cloud Point Temperature

Temperature Dependence of the Solubility of Carbon Dioxide in Imidazolium-Based Ionic Liquids

2009 ◽  
Vol 113 (38) ◽  
pp. 12727-12735 ◽  
Author(s):  
Daniela Kerlé ◽  
Ralf Ludwig ◽  
Alfons Geiger ◽  
Dietmar Paschek
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquids ◽  
Temperature Dependence
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