Journal
LANGMUIR
Volume 29, Issue 1, Pages 441-447Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la303812y
Keywords
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Funding
- KOSEF
- MOST [20120006280]
- Priority Research Center Program through NRF [20110031405, 20110027727, 20120005973]
- Industrial Strategic technology development program [10035274]
- Ministry of Knowledge Economy (MKE, Korea)
- National Research Foundation of Korea [2008-0060069, 2009-0094036] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Layered double hydroxide-quantum dot (LDH-QD) composites are synthesized via a room temperature LDH formation reaction in the presence of QDs. InP/ZnS (core/shell) QD, a heavy metal free QD, is used as a model constituent. Interactions between QDs (with negative zeta potentials), decorated with dihydrolipoic acids, and inherently positively charged metal hydroxide layers of LDH during the LDH formations are induced to form the LDH-QD composites. The formation of the LDH-QD composites affords significantly enhanced photoluminescence quantum yields and thermal- and photostabilities compared to their QD counterparts. In addition, the fluorescence from the solid LDH-QD composite preserved the initial optical properties of the QD colloid solution without noticeable deteriorations such as red shift or deep trap emission. Based on their advantageous optical properties, we also demonstrate the pseudo white light emitting diode, down-converted by the LDH-QD composites.
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