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  • 1
    Online Resource
    Online Resource
    An Efficient Synthesis of N,N,N’,N’,N″ -Pentamethyldipropylenetriamine
    SAGE Publications ; 2016
    In:  Journal of Chemical Research Vol. 40, No. 8 ( 2016-08), p. 486-488
    Details
    In: Journal of Chemical Research, SAGE Publications, Vol. 40, No. 8 ( 2016-08), p. 486-488
    Abstract: N,N,N’,N’,N″-Pentamethyldipropylenetriamine (PMDPTA) has for a long time been employed as an efficient catalyst in the production of polyurethane materials. A green and effective synthetic route to PMDPTA was successfully established from experiments described in this paper. PMDPTA was obtained from methylamine, acrylonitrile and formaldehyde via a Michael addition, catalytic hydrogenation and methylation in 65% overall yield. Furthermore, methanol was employed as the only solvent in all of the three steps, resulting in the convenient recovery of methanol. This route is thus suitable for industrial production.
    Type of Medium: Online Resource
    ISSN: 1747-5198 , 2047-6507
    URL: Article
    DOI: 10.3184/174751916X14665047142757
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 3010810-X
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  • 2
    Online Resource
    Online Resource
    Analyzing and modulating energy transfer in ternary-emissive system of quantum dot light-emitting diodes towards efficient emission
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 22 ( 2021-10-25), p. 36964-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 22 ( 2021-10-25), p. 36964-
    Abstract: The mechanisms for energy transfer including Förster resonance energy transfer (FRET) and radiative energy transfer in ternary-emissive system consists of blended-quantum dots (QDs, red-QDs blended with blue-QDs) emissive layer (EML) and blue-emissive hole-transport material that contained in quantum dot light-emitting diodes (QLEDs) are complicated. As the energy transfer could exhibit either positive or negative impact on QD’s photoluminescence (PL) and electroluminescence (EL), it is important to analyze and modulate energy transfer in such ternary-emissive system to obtain high-efficiency QLEDs. In this work, we have demonstrated that proper B-QDs doping has a positive impact on R-QDs’ PL and EL, where these improvements were attributed to the B-QDs’ spacing effect on R-QDs which weakens homogeneous FRET among R-QDs and near 100% efficient heterogeneous FRET from B-QDs to R-QDs. With optimization based on the analysis of energy transfer, the PL quantum yield of blended-QDs (with R:B blending ratio of 90:10, in quality) film has been enhanced by 35% compared with that of unblended R-QDs film. Moreover, thanks to the spacing effect and high-efficiency FRET from B-QDs to R-QDs, the external quantum efficiency of QLEDs that integrate optimized blended-QDs (R:B=90:10) EML reaches 22.1%, which is 15% higher than that of the control sample (19.2%) with unblended R-QDs EML. This work provides a systematically analytical method to study the energy transfer in ternary-emissive system, and gives a valid reference for the analysis and development of the emerging QLEDs that with blended-QDs EML.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.442578
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 1491859-6
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