Lead-Free Highly Efficient Blue-Emitting Cs3Cu2I5 with 0D Electronic Structure
Lead-Free Highly Efficient Blue-Emitting Cs3Cu2I5 with 0D Electronic Structure
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DOI：
10.1002/adma.201804547
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发表时间：
2018-10-25
影响因子：
29.4
通讯作者：
Hosono, Hideo
中科院分区：
文献类型：
--
作者：
Jun, Taehwan;Sim, Kihyung;Hosono, Hideo
卤化物钙钛矿化合物，包括CsPbX_3（X = Cl，Br，I），在光电子学领域受到了广泛的关注。然而，铅的毒性和这些钙钛矿的低光致发光量子产率（PLQY）阻碍了它们的使用。在这项工作中，新的卤化物材料，满足要求：（一）无毒，（二）高PLQY，和（iii）易于制造的薄膜通过溶液过程进行了探索。特别地，考虑具有低维电子结构的卤化铜（I）化合物。Cs3Cu2I5具有0D光活性位点，并且表现出蓝光发射（约445 nm），对于单晶和薄膜分别具有约90和约60%的非常高的PLQY。激子结合能约为490 meV，很好地解释了Cs_3Cu_2I_5的零维电子性质。使用溶液衍生的Cs3Cu2I5薄膜展示了无铅卤化物的蓝色电致发光。
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 (approximate to 445 nm) with very high PLQYs of approximate to 90 and approximate to 60% for single crystals and thin films, respectively. The large exciton binding energy of approximate to 490 meV explains well the 0D electronic nature of Cs3Cu2I5. Blue electroluminescence of Pb-free halides is demonstrated using solution-derived Cs3Cu2I5 thin films.