Preparation And Luminescece Properties Of Novel Cubic Polyhedral Oligosilsesquioxanes-based Luminescent Materials

Lanthanide hybrid luminescent materials have shown great potential in the fields of display,illumination or sensing in recent years attributed to their excellent luminescent properties.However,finding a simple,low-cost and environmentally friendly method for preparing such kind of materials is still a challengable task.Through the combination of POSS and lanthanide complex,hybrid material with enhanced luminescent properties was achieved.Improved photo-and thermal-stability were also obtained.These excellent properties render the Polyhedral oligomeric silsesquioxane a good candidate as the matrix.In this study,we focused on new materials,new structures and new morphologies.And the main content is as follow:1.Aminopropyltriethoxysilane（APTES）and Tricyclo[7.3.3.15,11]heptasiloxane-3,7,14-triol,1,3,5,7,9,11,14-heptakis（2-methylpropyl）（T）were reacted through the conversion of functional groups to"block",then NH₂-POSS were obtained.In addition,the formation of 8NH₂-POSS were prepared by APTES concentration.OBAPOSS and MBAPOSS were constructed through the grafting of 4-Carboxybenzaldehyde（BA）moiety to each vertex of POSS.The experiments synthesized novel lanthanide/cubic polyhedral oligomeric silsesquioxane luminescent material with OBAPOSS（or MBAPOSS）and Tb³⁺.Thermal-and photo-stability of the obtained hybrid materials were achieved compared with its corresponding pure complexes.2.Herein,we present the water-soluble hybrid composites which are realized by linking Na₃[Ln（dpa）₃]（dpa=2,6-Pyridinedicarboxylic acid）to 8NH₂-POSS through the hydrogen-bonding interaction between the oxygen atoms of the carboxylate groups of dpa and the hydrogen-bond donor amino groups.The material show highly sensitive and selective sensing for Cu²⁺in aqueous solution which made it a good candidate as Cu²⁺detector in biological systems in the future.And the influence of molar ratio of Eu and Tb on their luminescence properties was also studied.Both of them are able to emit multi-colored luminescence（from red via yellow to green）,which serve as a basis for the rational design of highly luminescent materials.