Details

Autor(en) / Beteiligte

• Jung, Hak-Sung
• Kim, Young-Jae
• Cho, Junsang
• Yoon, Tae-Jong
• Lee, Jin-Kyu

Titel

Silica-coated gradient alloy quantum dots with high luminescence for converter materials in white light-emitting diodesElectronic supplementary information (ESI) available: PL spectra of QDs, QDs@PVP, and QD@SiO2-based WLED, DLS data and TEM images of QDs@SiO2. See DOI: 10.1039/c5ra24203g

Erscheinungsjahr

2015-12

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Hydrophobic gradient alloy quantum dots (QDs) were prepared through a facile organic route. The amphiphilic, non-ionic polymer (PVP) was absorbed onto the surface of QDs, and therefore, the PVP coated QD (QD@PVP) could be dispersible in both polar and non-polar solvents. The QD@PVP was dispersed in ethanol and tetraethyl orthosilicate (TEOS) was added with a basic catalyst in order to generate silica shell encapsulated QDs (QD@SiO 2 ). We report a preparation method for QD@SiO 2 that maintains their high luminescence and thermal- and photo-stability using dimethylamine (DMA) as a basic catalyst. White light-emitting-diodes (WLEDs) incorporating the QD@SiO 2 exhibited good performance in terms of superior luminescence efficiency and high color purity. DMA catalyst played a major role in maintaining the luminescence of the QDs. After silica coating, QD@SiO 2 exhibited high stability and retained their initial photoluminescence (PL) intensity in a flexible polymer nanocomposite film.