Stepwise Solution-Interfacial Nanoarchitectonics for Assembled Film with Full-Color and White-Light Circularly Polarized Luminescence

Abstract

The fabrication of chiral thin films with tunable circularly polarized luminescence (CPL) colors is important in developing chiroptical materials but remains challenging due to the lack of assembly-initiated chiral film formation methodology. Here, by adopting a combined solution aggregation and interfacial assembly strategy, we report the fabrication of chiral film materials with full-color and white-light CPL. A biquinoline glutamic acid ester (abbreviated as BQGE) shows a typical aggregation-induced emission property with blue CPL after solution aggregation. Subsequent interfacial assembly of these solution aggregates on a solid substrate leads to the formation of a CPL active film consisting of nanobelt structures. Since the BQGE molecule has a coordination site, the CPL emission of an individual BQGE film can be extended from blue to green emission upon coordination with a zinc ion, accompanied by morphology transition from nanobelts to nanofibers. Further extension to red-color CPL is successfully achieved by coassembly with an achiral acceptor dye. Interestingly, the proper combination of coordination ratio and acceptor loading ratio provides bright white-light CPL emission from the BQGE/Zn2+/PDA triad composite film. This work provides a new approach to fabricating chiroptical film materials with controlled microscopic morphology and tunable CPL properties.

Materials Nanoarchitectonics at Dynamic Interfaces: Structure Formation and Functional Manipulation

“…The research papers that claim to be nanoarchitectonics are as follows. The application of nanoarchitectonics can be seen in basic fields, such as the synthesis of functional materials [ 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 , 212 , 213 , 214 , 215 , 216 , 217 , 218 , 219 ], the control of specific structures [ 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 , 230 ], the creation of structures [ 231 , 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 ], basic physics [ 241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 ], relatively basic biochemistry [ 253 , 254 ,…”

“…The research papers that claim to be nanoarchitectonics are as follows. The application of nanoarchitectonics can be seen in basic fields, such as the synthesis of functional materials [204][205][206][207][208][209][210][211][212][213][214][215][216][217][218][219], the control of specific structures [220][221][222][223][224][225][226][227][228][229][230], the creation of structures [231][232][233][234][235][236][237][238][239][240], basic physics [241][242][243][244][245][246][247][248][249][250][251][252]<...…”

Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence

“…One single emitter with broad-vis-spectrum luminescence is of particular importance all along since it allows to avoid energy transfer among mixed components and simplify device fabrication [16][17][18] , but to date, materials with single-emitted full-color CPL are still absent. Intensive efforts have produced chiral organic molecules [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] , MOFs 38,39 , polymers [40][41][42][43][44][45][46] and inorganic nanostructures [47][48][49] with multicolor emission. Nonetheless, these full-color-CPL-active materials still cannot satisfy accurate practical requirements because of the complicated and imprecise regulation of multi-emitters, so it is pressing and of particular importance to develop SF-CPL-active materials with large g lum values, simplified adjustment and customized potential.…”