Activating room-temperature phosphorescence of 1,8-naphthalimide by doping into aromatic dicarboxylic acids

Abstract

Room-temperature phosphorescence of 1,8-naphthalimide was activated by doping it into aromatic dicarboxylic acid. The doping system gives bright yellow afterglow and 1,8-naphthalimide and isophthalic acid (0.02 mol % doping content)...

Host to regulate the T1–S1and T1–S0processes of guest excitons in doped systems to control the TADF and RTP emissions

“…46–48 Moreover, some research results show that the host matrix can promote the transfer process of guest excitons between different energy levels. 49–54 Additionally, some doped materials that we have previously developed do also have the properties of emitting both TADF and RTP simultaneously. 28 Therefore, it is feasible to use different hosts to precisely modulate the ISC/RISC process of excitons, thereby ultimately regulating the luminescence phenomenon of doped materials.…”

Solvent-Modulated Self-Assembly of Naphthalenediimide-Based Cd(II) Complexes and the Controllable Photochromism via Conformational Isomerization

“…Since the 21st century, optical information functional materials developed with light as the information carrier and combined with optical technology have shown great application potential in optics and electricity and have contributed to improving the quality of human life. − Among them, photochromic functional materials have piqued the interest of scientists because of their practical application value and potential development space in optics, − magnetism, medicine, catalysis, fluorescence, , and so on. Among various photochromic materials, coordination polymers (CPs) photochromic systems based on electron donor–acceptor (D-A) type photo-induced intermolecular electron transfer (ET) have received a lot of attention due to their exceptional photochromic characteristics, such as instantaneous photoresponse, wide photoresponse range, and intense color rendering contrast. − However, the majority of reported ET photochromic materials have photoresponse ranges that are generally in the UV area or X-ray region for higher energy excitations. − Since UV/X-ray light accounts for only a tiny fraction of the total solar energy, the difficulty of obtaining UV/X-ray light in daily life dramatically limits the application of such photochromic materials .…”

“…Based on the abovementioned context, NDI ligands were selected as EAs to combine with electron-rich terephthalic acid to obtain two different Cd 2+ complexes under different solvent conditions, namely, [Cd 0.5 (NDI)(HBDC)]•H 2 O (1) and {[Cd(NDI) 0.5 (BDC)]•MeCN} n (2). They exhibit different ET-based photochromic behavior because the coplanarity of the NDI rings affects the photochromic properties of the complexes (1 non-coplanar, non-photochromic; 2 coplanar, photochromic).…”

Dual Guests Synergistically Tune the Phosphorescence Properties of Doped Systems through Chemical Interactions with Bases

“…These results suggest that the main source of excited state energy of doped system is not the energy absorbed by the host. The T 1 state of the host can be the bridge between the S 1 and T 1 states of the guest, so the excitons can transfer from the S 1 state to T 1 state of the guest through the path of the T 1 state of the host (Figure h). − As shown in Figure d, the S 1 and T 1 states of OxISQ are 3.90 and 2.74 eV, respectively, and the Δ E ST is 1.16 eV. However, the band gap between the S 1 state of OxISQ and the T 1 state of SDB is 0.88 eV (the energy level of SDB is calculated in a crystalline state); the smaller Δ E ST is beneficial for the ISC process of excitons.…”