Lead‐Free Highly Efficient Blue‐Emitting Cs3Cu2I5 with 0D Electronic Structure
By Taehwan Jun, Kihyung Sim, S. Iimura, M. Sasase, H. Kamioka, Junghwan Kim, Hideo Hosono. Advances in Materials, 2018
607 citations recorded by the source corpus.
Halide perovskites, including CsPbX3 (X = Cl, Br, I), have gained much attention in the field of optoelectronics. However, the toxicity of Pb and the low photoluminescence quantum yield (PLQY) of these perovskites hamper their use. In this work, new halide materials that meet the requirements of: (i) nontoxicity, (ii) high PLQY, and (iii) ease of fabrication of thin films via the solution process are explored. In particular, copper(I) halide compounds with low‐dimensional electronic structures are considered. Cs3Cu2I5 has a 0D photoactive site and exhibits blue emission (≈445 nm) with very high PLQYs of ≈90 and ≈60% for single crystals and thin films, respectively. The large exciton binding energy of ≈490 meV explains well the 0D electronic nature of Cs3Cu2I5. Blue electroluminescence of Pb‐free halides is demonstrated using solution‐derived Cs3Cu2I5 thin films.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7005031271aae8d5386e8c8ce2ae6c0863a91b39
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Citations in the corpus
- Highly-efficient all-inorganic lead-free 1D CsCu2I3 single crystal for white-light emitting diodes and UV photodetection (2021, methodology): “This lifetime is much shorter than that of 0D Cs3Cu2I5 SC (~464 ns) [24], but is close to 1D C4N2H14PbBr4 perovskite bulk crystals, suggesting that the CsCu2I3 SC may have the similar PL mechanism as that of the 1D perovskite C4N2H14PbBr4 from self-trapped excitons [9].”