Tunable and purified luminescence via energy transfer and delamination of LRH (R=Tb, Y) composites with 8-hydroxypyrene-1,3,6-trisulphonate.

This work demonstrates tunable and purified luminescence via one-step delamination of HPTS/OS-LRH composites (HPTS is trisodium 8-hydroxy-pyrene-1,3,6-trisulphonate, OS is sodium salt of 1-octane sulfonic acid, LRH is layered rare-earth hydroxide, R=Tb, Y) along with energy transfer. The HPTSOS-LTbYH composites presented varied luminescence behavior depending on their physical state. In solid state, dual-color luminescence was observed: blue-dominant emissions (437nm) for HPTSOS-LTbH, and blue- (437nm) to green-dominant (516nm) luminescence for HPTSOS-LTbYH. In delaminated state in famamide, purified luminescence was present: pure blue emission (440nm) for HPTSOS-LTbH and HPTSOS-LTbYH (y≥0.5), while pure bluish-green emission (498nm) for HPTSOS-LTbYH (y≤0.3). Both the delamination of the composites and energy transfer from layer Tb to HPTS contributed to the blue luminescence. The intriguing energy transfer process between photoactive inorganic hosts and organic guests can be utilized to fabricate hybrid materials with superior luminescence property.