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 HPTSxOS1-x-LTbyY1-yH composites presented varied luminescence behavior depending on their physical state. In solid state, dual-color luminescence was observed: blue-dominant emissions (437nm) for HPTSxOS1-x-LTbH, and blue- (437nm) to green-dominant (516nm) luminescence for HPTS0.02OS0.98-LTbyY1-yH. In delaminated state in famamide, purified luminescence was present: pure blue emission (440nm) for HPTSxOS1-x-LTbH and HPTS0.02OS0.98-LTbyY1-yH (y≥0.5), while pure bluish-green emission (498nm) for HPTS0.02OS0.98-LTbyY1-yH (y≤0.3). Both the delamination of the composites and energy transfer from layer Tb(3+) 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.