Switching on room-temperature phosphorescence of photochromic hybrid heterostructures by anion-π interactions

Photochromic and Room Temperature Phosphorescent Donor–Acceptor Hybrid Crystals Regulated by Core-Substituted Naphthalenediimides

“…ISC can be enhanced by the heavy-atom effect. As the atomic number increases, spin–orbit coupling (SOC) between states of different spin multiplicity can be promoted. , Therefore, with the introduction of the heavy halogen atom, they effectively reduce the Δ E ST and promote ISC. ,, At last, it is shown that the QY of RTP can be effectively improved by the introduction of heavy atoms under the condition of matching energy levels. Therefore, the RTP intensities and QYs of hybrids 1 and 2 containing heavy atoms are much higher than those of hybrid 3 .…”

“…16 In recent years, Lu and our groups have reported that many hybrid crystal materials are composed of NDIs and POMs via anion-π interactions, which not only possess photochromic behavior but also present room temperature phosphorescence. 10,11,16 Although organic components are an important part of hybrid materials, there are still a few studies that explore the difference of the above two properties by modifying organic moieties. Based on previous research, chemical modification at core positions of NDIs (c-NDI) can notably tune the properties through introducing the substitution of electron withdrawing groups or electron donating groups at core positions, like alkyl, cyano, etc.…”

“…On the one hand, intermolecular charge transfer (ICT) states can be formed by the donor and acceptor of a hybrid with matching energy levels and bridge the Δ E ST , which further improve the intersystem crossing (ISC) process and thus activate phosphorescence at room temperature upon irradiation. , For example, the hybrids composed of NDIs and PW 12 O 40 3– or SiW 12 O 40 4– can produce RTP due to the compatible energy levels between donors and acceptors . On the other hand, the introduction of heavy atoms could promote efficient ISC and bring about RTP. , Compared with a hybrid including PMo 12 O 40 3– , the quantum yield (QY) of a hybrid containing SiW 12 O 40 4– is higher and produces up to a 7.2% yield owing to the heavy-atom effect . In recent years, Lu and our groups have reported that many hybrid crystal materials are composed of NDIs and POMs via anion-π interactions, which not only possess photochromic behavior but also present room temperature phosphorescence. ,, Although organic components are an important part of hybrid materials, there are still a few studies that explore the difference of the above two properties by modifying organic moieties.…”

“…On the other hand, the introduction of heavy atoms could promote efficient ISC and bring about RTP. , Compared with a hybrid including PMo 12 O 40 3– , the quantum yield (QY) of a hybrid containing SiW 12 O 40 4– is higher and produces up to a 7.2% yield owing to the heavy-atom effect . In recent years, Lu and our groups have reported that many hybrid crystal materials are composed of NDIs and POMs via anion-π interactions, which not only possess photochromic behavior but also present room temperature phosphorescence. ,, Although organic components are an important part of hybrid materials, there are still a few studies that explore the difference of the above two properties by modifying organic moieties.…”

Dynamic Manipulating Space‐Resolved Persistent Luminescence in Core–Shell MOFs Heterostructures via Reversible Photochromism

“…Quite recently, Ma and coworkers reported two photochromic polymers with photoactivated RTP properties. [46] However, photochromic materials with adjustable and visible persistent luminescence (i.e., afterglow) are still difficult, [46][47][48][49] owing to the relatively short RTP lifetime. As we have known, only Bo and Lis group reported the modulation of fluorescence/afterglow in an amorphous photochromic polymer (a-PA) via both light and heat stimuli.…”