Abstract
Low-dimensional lead-free luminescent halides have emerged as highly promising phosphors for white-light emission. Recently, we reported a broadband blue-emitting copper(I) iodide-based material, Cs3Cu2I5, with a high photoluminescence quantum yield (PLQY) (∼90%) and a zero-dimensional nature, providing significant dimensionality for the photoactive site. However, this material is insufficient as a white-light emitter owing to the deficient yellow emission. In this paper, we report a novel yellow luminescent phosphor, CsCu2I3, with a 1D structure for the photoactive site. This material exhibits a broadband emission centered at ∼560 nm with a PLQY of ∼8%. We demonstrate a thin film with white-light emission that can be fabricated using one-step spin-coating of a mixed precursor solution of 1D CsCu2I3 (yellow) and 0D Cs3Cu2I5 (blue).
Highlights
The discovery of new solid-state lighting (SSL) holds great potential for a variety of applications, such as white-light-emitting diodes (LEDs), smart windows, and photodetectors
Among the applications of SSL, white LEDs have steadily emerged as a replacement for the conventional incandescent and fluorescent lamps in our life because of their low-energy consumption and high efficiency
This class of materials is limited for use in white LEDs owing to the toxicity of including chemical elements, such as Cd and Pb, and their complicated synthesis process
Summary
The discovery of new solid-state lighting (SSL) holds great potential for a variety of applications, such as white-light-emitting diodes (LEDs), smart windows, and photodetectors. One-step solution synthesis of white-light-emitting films via dimensionality control of the Cs–Cu–I system
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