1. One-step solution synthesis of white-light emitting films via dimensionality control of the Cs–Cu–I system
- Author
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Soshi Iimura, Kihyung Sim, Yoshihiko Kanemitsu, Masato Sasase, Junghwan Kim, Hideo Hosono, Taketo Handa, and Taehwan Jun
- Subjects
Photoluminescence ,Materials science ,lcsh:Biotechnology ,chemistry.chemical_element ,Halide ,Quantum yield ,Phosphor ,02 engineering and technology ,01 natural sciences ,lcsh:TP248.13-248.65 ,0103 physical sciences ,General Materials Science ,Thin film ,Common emitter ,010302 applied physics ,business.industry ,General Engineering ,021001 nanoscience & nanotechnology ,Copper ,lcsh:QC1-999 ,chemistry ,Optoelectronics ,0210 nano-technology ,Luminescence ,business ,lcsh:Physics - 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).
- Published
- 2019