Eren, Guncem OzgunSadeghi, SadraJalali, Houman BahmaniRitter, MaximilianHan, MertcanBaylam, IsinsuNizamoglu, SedatBahmani Jalali, Houman2025-09-252025-09-2520211944-82441944-8252https://doi.org/10.1021/acsami.1c08118https://hdl.handle.net/20.500.12573/3410Ow-Yang, Cleva W./0000-0002-2909-0957; Toker, Isinsu Baylam/0000-0003-2327-9035; Oz, Fatma/0000-0003-0646-9064; Sadeghi, Sadra/0000-0002-8569-1626; Melikov, Rustamzhon/0000-0003-2214-7604; Lechner, Rainer T/0000-0003-0038-1088; Ritter, Maximilian/0000-0001-5368-2007; Sahin, Mehmet/0000-0002-9419-1711; Han, Mertcan/0000-0002-3543-5894; Onal, Asim/0000-0003-3682-6042; Bahmani Jalali, Houman/0000-0001-7212-9098It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low quantum yield due to the separation of the electron and hole wavefunctions. Recently, high quantum yield levels were reported for cadmium-based typeII QDs. Hence, the quest for finding non-toxic and efficient type-II QDs is continuing. Herein, we demonstrate environmentally benign type-II InP/ZnO/ZnS core/shell/shell QDs that reach a high quantum yield of similar to 91%. For this, ZnO layer was grown on core InP QDs by thermal decomposition, which was followed by a ZnS layer via successive ionic layer adsorption. The small-angle Xray scattering shows that spherical InP core and InP/ZnO core/ shell QDs turn into elliptical particles with the growth of the ZnS shell. To conserve the quantum efficiency of QDs in device architectures, InP/ZnO/ZnS QDs were integrated in the liquid state on blue light-emitting diodes (LEDs) as down-converters that led to an external quantum efficiency of 9.4% and a power conversion efficiency of 6.8%, respectively, which is the most efficient QD-LED using type-II QDs. This study pointed out that cadmium-free type-II QDs can reach high efficiency levels, which can stimulate novel forms of devices and nanomaterials for bioimaging, display, and lighting.eninfo:eu-repo/semantics/openAccessIndium PhoSPHideQuantum DotsType-II Band AlignmentLiquid LedColor ConversionArticle10.1021/acsami.1c081182-s2.0-85110960234