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  • Lead-Free Highly Efficient Blue-Emitting Cs3 Cu2 I5 with 0D Electronic Structure.

Lead-Free Highly Efficient Blue-Emitting Cs3 Cu2 I5 with 0D Electronic Structure.

Advanced materials (Deerfield Beach, Fla.) (2018-09-15)
Taehwan Jun, Kihyung Sim, Soshi Iimura, Masato Sasase, Hayato Kamioka, Junghwan Kim, Hideo Hosono
ABSTRACT

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. Cs3 Cu2 I5 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 Cs3 Cu2 I5 . Blue electroluminescence of Pb-free halides is demonstrated using solution-derived Cs3 Cu2 I5 thin films.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Copper(I) iodide, 99.999% trace metals basis
Sigma-Aldrich
Poly(dimethylsiloxane), viscosity 1.0 cSt (25 °C)
Sigma-Aldrich
Cesium iodide, 99.9% trace metals basis