Malakar Partha, Modak Debadrita, Prasad Edamana
Department of Chemistry, Indian Institute of Technology Madras (IITM), Chennai 600036, India.
Chem Commun (Camb). 2016 Mar 21;52(23):4309-12. doi: 10.1039/c5cc10112c.
Organic materials generating pure white light emission have attracted considerable attention in recent times due to their potential applications in lighting and display devices. We have used anthracene carboxylic acid (AnA) and anthracene carbaldehyde (AnC) to generate white light using solvent induced selective self-assembly (SISSA). Mechanistically, SISSA prevents a fast intersystem crossing of the AnC monomer and generates an emissive state from the self-assembled AnC. While AnA emits in the blue region, the self-assembled AnC emits in the greenish yellow region with identical emission intensity. CIE coordinates (0.33, 0.33) of pure white light have been achieved by incorporating orange emitting rhodamine B. More importantly, the pure white light formation has been demonstrated at desired temperatures in both aqueous medium as well as in an agar-agar hydrogel.
近年来，由于有机材料在照明和显示设备中的潜在应用，能够产生纯白光发射的有机材料受到了广泛关注。我们使用蒽羧酸（AnA）和蒽甲醛（AnC），通过溶剂诱导选择性自组装（SISSA）来产生白光。从机理上讲，SISSA可防止AnC单体快速发生系间窜越，并从自组装的AnC产生发射态。虽然AnA在蓝色区域发射，但自组装的AnC在绿黄色区域发射，且发射强度相同。通过加入橙色发射的罗丹明B，实现了纯白光的CIE坐标（0.33, 0.33）。更重要的是，在水性介质以及琼脂水凝胶中，均已在所需温度下证明了纯白光的形成。
