Molecular asterisks with a persulfurated benzene core are among the strongest organic phosphorescent emitters in the solid state

Organic Nanocrystals with Bright Red Persistent Room‐Temperature Phosphorescence for Biological Applications

“…[14,15] To promote ISC and to favor pure organic RTP, heavy halogen atoms,a s well as organic groups with lone electron pairs,s uch as aromatic carbonyls,h ave been successfully introduced to organic compounds. [25][26][27] Long-lasting luminescence and good biocompatibility are highly desirable for in vitro and in vivo imaging without the interference of autofluorescence.D espite the fact that RTP materials have proven to have such qualities,t here are very few successful attempts to bring them into biological systems. [20] So far,s everal strategies have been applied to minimize the intermolecular and intramolecular motions to activate the phosphorescence emission, which include hostguest doping systems with supramolecular gel entrapping, [21] metal-organic framework coordination [22] and rigid solid protection, [4] polymer assistance, [23,24] and crystal formation.…”

Crystallization-induced phosphorescence of pure organic luminogens

“…A series of functionalized persulfurated benzene mole-308 cules (Fig. 7a) give no emission in solutions, however, they afford 309 strong green RTP with efficiency up to 100% in the crystalline state 310 [23]. This is a consequence of decreased intramolecular motions, 311 however, conformational and rotamer factors along with sub-312 stituents may also take effect.…”

“…As depicted in Fig. 7, a 305 group of hetero sulfur (S) and tellurium (Te) containing pure 306 organic luminogens with CIP characteristics were developed 307 [23,24]. A series of functionalized persulfurated benzene mole-308 cules (Fig.…”

“…Subsequently, on the basis of fundamental considerations of 54 carbonyl groups, heteroatoms, and heavy atom effect [1a,14], 55 efficient RTP from pure organic luminogens was received through Chinese Chemical Letters xxx (2016) xxx-xxx 56 further (co)crystallization, doping/trapping in rigid matrices, creat-57 ing intermolecular interactions between luminogens and hosts, and 58 even singlet fission [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In this review, we focus on the recent 59 progress of CIP luminogens, aiming to show a brief picture on this 60 exciting renewed area.…”

Intersystem Crossing Mechanisms in the Room Temperature Phosphorescence of Crystalline Organic Compounds

“…31,32 The transition energy calculated by TD-DFT for the transition from T 2 with an intramolecular CT character to S 0 matched the measured phosphorescence band. The extraordinarily good RTP efficiency was attributed to intramolecular CH-π interactions between the peripheral toluene moieties, which might keep T 2 and T 1 well above S 0 in energy, preventing the T n -to-S 0 transitions.…”