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The mechanism of thermally-activated...

Zhang, Jing.

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The mechanism of thermally-activated photoluminescence quenching and its correlation with transport in electronically-coupled pbs quantum dot arrays.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The mechanism of thermally-activated photoluminescence quenching and its correlation with transport in electronically-coupled pbs quantum dot arrays./
作者:	Zhang, Jing.
面頁冊數:	44 p.
附註:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1546585
ISBN:	9781303459771

The mechanism of thermally-activated photoluminescence quenching and its correlation with transport in electronically-coupled pbs quantum dot arrays.
Zhang, Jing.

The mechanism of thermally-activated photoluminescence quenching and its correlation with transport in electronically-coupled pbs quantum dot arrays. - 44 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--University of Colorado at Boulder, 2013.

We have measured the temperature-dependent photoluminescence (PL) and quantum yield (QY) of a series of alkanedithiol-treated PbS quantum dot (QD) films as a function of QD size and the length of the alkane chain. These films have PLQYs ranging 2% - 40% at 20 K, with the lowest values measured for shorter ligands and larger QD sizes. All films show PL quenching and shifting/narrowing with increased temperature characterized by exponential (Urbach) band tail behavior. The PLQY vs temperature takes a form derived from an Arrhenius-like dependence of activated charge separation. We also find temperature-dependent photoconductivity (sigma), showing an Arrhenius relationship with inverse temperature (T-0.5 at lower temperature matching variable-range hopping model and T-1 at higher temperature corresponding to near-neighbor hopping model), is inversely related with temperature-dependent PL. This indicates that temperature-dependent PL is a relevant measure of transport properties in the presence of deep trap states and reasonably high charge carrier mobilities.

ISBN: 9781303459771Subjects--Topical Terms:

560527
Chemistry, Physical.

The mechanism of thermally-activated photoluminescence quenching and its correlation with transport in electronically-coupled pbs quantum dot arrays.
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500 $a Adviser: Arthur J. Nozik.
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520 $a We have measured the temperature-dependent photoluminescence (PL) and quantum yield (QY) of a series of alkanedithiol-treated PbS quantum dot (QD) films as a function of QD size and the length of the alkane chain. These films have PLQYs ranging 2% - 40% at 20 K, with the lowest values measured for shorter ligands and larger QD sizes. All films show PL quenching and shifting/narrowing with increased temperature characterized by exponential (Urbach) band tail behavior. The PLQY vs temperature takes a form derived from an Arrhenius-like dependence of activated charge separation. We also find temperature-dependent photoconductivity (sigma), showing an Arrhenius relationship with inverse temperature (T-0.5 at lower temperature matching variable-range hopping model and T-1 at higher temperature corresponding to near-neighbor hopping model), is inversely related with temperature-dependent PL. This indicates that temperature-dependent PL is a relevant measure of transport properties in the presence of deep trap states and reasonably high charge carrier mobilities.
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