A second-order nonlinear optical dendronized hyperbranched polymer containing isolation chromophores: achieving good optical nonlinearity and stability simultaneously

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（5）
• 页码范围: 584-591
• 页数: 8页
• 语种: 英文

摘要

Large nonlinear optical (NLO) coefficient and good stability,two essential factors to evaluate second-order NLO materials,are difficult to be achieved in one molecule simultaneously.Herein,by utilizing the concept of "isolation chromophore","isolation group" and dendritic structure,a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship.For the small dendritic molecule D-NS,it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 ℃,which extremely limits its real application.After introducing D-NS into a dendronized hyperbranched polymer chains,the obtained DHP-NS also shows a high d33 value of 101 pm/V,but much better stability than D-NS.Even when its thin film was heated to 120 ℃,no obvious decay can be observed in the d33 value of DHP-NS.This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.