An unprecedented {Y⊂Y} type disk-like Y nanocluster featuring electroluminescence property in OLED device

Although great efforts have been made to explore the exquisite rare-earth (RE) clusters, the design and construction of planar RE clusters with disk-like geometrical features are still scarce. Herein, a novel disk-like RE-cluster Y 12 (abbreviated as 1 ), formulated as [Y 12 (L) 10 (CO 3 ) 4 (NO 3 ) 2 (μ 3 -OH) 6 ] (H 2 L = 7,7′-(2-methylmethylene)bis(8-quinolonol)) was synthesized successfully under solvothermal conditions. Owing to the template effect and fruitful coordination modes of NO 3 − , a novel Y 2 ⊂Y 10 type structure with dual-core in the center position of the cluster, which distinguishes it from the traditional brucite-type disk-like RE-cluster was achieved. Based on the ESI-MS analysis, the possible assembly mechanism of Y 5 → Y 8 → Y 12 is proposed. The luminescence investigation illustrates that this cluster not only shows green emission in solid-state and common organic solvents but also has obvious electroluminescent performance, which can be used as the emitting layer in organic light-emitting diodes (OLEDs). An unprecedented disk-like Y 12 cluster with unique Y 2 ⊂Y 10 type structure was achieved successfully, which is the largest non-brucite type disk-like RE cluster and exhibits obvious electroluminescence performance in OLED device.