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Abstract Rare‐earth element‐free materials that exhibit strong room temperature phosphorescence (RTP) and X‐ray scintillation properties are gaining global interest incessantly in the recent years. This work reports a series of easily synthesizable cubane Cu 4 I 4 ‐triarsenic clusters Cu 4 I 4 (R 3 As) 3 L (L = none or nitrile), that exhibit a strong yellow‐green RTP with quantum efficiencies up to 100% and short decay times (4.4–4.9 µs). The title cluster complexes display X‐ray scintillation properties with a record ultralow detection limit (18.1 nGy s −1 ) and a perfectly linear dose rate response within a remarkably wide dose rate window (0–640 µGy air s −1 ). The cluster Cu 4 I 4 (Ph 3 As) 3 is highlighted as an efficient phosphor for UV‐pumped white and yellow LED devices, demonstrating an excellent white spectrum with a CIE index of (0.32,0.33) and bright yellow emission, respectively. These results may stimulate the future efforts in designing highly efficient arsenic‐based RTP materials and enriching the Cu 4 I 4 cluster family.
Demyanov et al. (Mon,) studied this question.