School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Angew Chem Int Ed Engl. 2017 Jul 3;56(28):8134-8138. doi: 10.1002/anie.201703264. Epub 2017 Jun 19.
We successfully prepared QDs incorporated into a silica/alumina monolith (QDs-SAM) by a simple sol-gel reaction of an Al-Si single precursor with CsPbBr QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90 %, and good photostability under strong illumination of blue light for 300 h. We show that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr QDs from surface damages during the sol-gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr QDs but also prevented the aggregation of QDs and made the monolith transparent. The CsPbBr QDs-SAM in powder form was easily mixed into the resins and applied as color-converting layer with curing on blue light-emitting diodes (LED). The material showed a high luminous efficacy of 80 lm W and a narrow emission with a full width at half maximum (FWHM) of 25 nm.
我们成功地通过简单的溶胶-凝胶反应，使用含有 CsPbBr QD 的 Al-Si 单前体制备了掺入二氧化硅/氧化铝整体柱中的 QD（QD-SAM），无需添加水和催化剂。所得透明整体柱的荧光量子产率高达 90%，在强蓝光照射下 300 小时后仍具有良好的光稳定性。我们表明，初步的二癸基二甲基溴化铵（DDAB）配体交换对于保护 CsPbBr QD 在溶胶-凝胶反应中免受表面损伤非常重要，这不仅使我们能够保持 CsPbBr QD 的原始光学性质，还防止了 QD 的聚集并使整体柱透明。粉末状的 CsPbBr QD-SAM 很容易混入树脂中，并在蓝光发光二极管（LED）上固化作为显色转换层使用。该材料表现出 80 lm/W 的高光效和 25nm 的半峰全宽（FWHM）窄发射。
