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A First Wide‐Open LDH Structure Hosting InP/ZnS QDs: A New Route Toward Efficient and Photostable Red‐Emitting Phosphor

Abstract : The architecture of Zn-Al layered double hydroxides (LDHs), organo-modified with bola-amphiphiles molecules, is matching its interlayer space to the size of narrow-band red-emitting InP/ZnS core–shell quantum dots (QDs) to form original high-performance functional organic–inorganic QD-bola-LDH hybrids. The success of size-matching interlayer space (SMIS) approach is confirmed by X-ray diffraction, small angle X-ray scattering (SAXS), TEM, STEM-HAADF, and photoluminescence investigations. The QD-Bola-LDH hybrid exhibits a photoluminescence quantum yield three times higher than that of pristine InP/ZnS QDs and provides an easy dispersion into silicone-based resins, what makes the SMIS approach a change of paradigm compared to intercalation chemistry using common host structures. Moreover, this novel hybrid presents low QD–QD energy transfer comparable to that obtained for QDs in suspension. Composite silicone films incorporating InP/ZnS (0.27 wt%) QD-bola-LDH hybrids further show remarkable improved photostability relative to pristine QDs. An LED overlay consisting of a blue LED chip and silicone films loaded with QD-bola-LDH hybrids and YAG:Ce phosphors exhibits a color rendering index close to 94.
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https://hal.uca.fr/hal-03318403
Contributor : Rodolphe Valleix <>
Submitted on : Friday, September 10, 2021 - 1:08:36 PM
Last modification on : Wednesday, September 15, 2021 - 3:19:48 AM

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Rodolphe Valleix, Qian Zhang, Damien Boyer, Philippe Boutinaud, Geneviève Chadeyron, et al.. A First Wide‐Open LDH Structure Hosting InP/ZnS QDs: A New Route Toward Efficient and Photostable Red‐Emitting Phosphor. Advanced Materials, Wiley-VCH Verlag, 2021, pp.2103411. ⟨10.1002/adma.202103411⟩. ⟨hal-03318403⟩

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