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Examples of hybrid upconverter layer stacks taken from the literature. a) Device architecture of an upconverter using formamidinium lead iodide as a NIR absorber integrated with a phosphorescent OLED [45]. b) Layer stack of an upconverter consisting of an organic NIR charge generation layer (CGL) and a perovskite LED. TPBi denotes 2,2ʹ,2ʹ’-(1,3,5-benzinetriyl)-tris(1-phenyl-1H-benzimidazole). The four layers from ZnO to CsPbBr3 were processed from solution [24].
