Abstract
In this communication, we report a low-dimensional perovskite-related structure based on Cu(i) organometallic halide with strong green cluster-centred emission and near-unity photoluminescence quantum yield. The 0D [Rb(18-crown-6)](2)Cu4I6 was sucessfully applied for X-ray imaging screens which exhibit high spatial resolution of 16.8 lp mm(-1) and low detection limit of 458 nGy s(-1).