Construction and Application of Large Stokes-Shift Organic Room Temperature Phosphorescence Materials by Intermolecular Charge Transfer

Abstract

Notably, the intermolecular charge transfer between pyrene (Py) and benzophonenes (BPs) can significantly enhance the quantum yield of the triplet state of Py, which will convert Py from a fluorescence molecule to a phosphorescence molecule. The intermolecular charge transfer is confirmed by steady-state and time-resolved spectroscopy and theoretical study. Based on these foundations, Py is doped into BPs systems and a large Stokes-shift organic room temperature phosphorescence (ORTP) is observed. By using different benzophenone derivatives, a series of host–guest ORTP materials with different luminescent properties adjusted by intermolecular charge transfer features are developed. Fortunately, these host–guest ORTP systems from benzophenone derivatives and pyrene are readily fabricated, and the red gradient color lasting as long as 3 s is observed after removing UV excitation. This host–guest charge transfer strategy plays an important role in the mechanism of the luminous type shift. Our strategy paves the way to design ORTP materials conveniently and apply these materials in encryption and temperature alarm device.

Carbon Nanohoops: Multiple Molecular Templates for Exploring Spectroscopic, Electronic, and Thermoelectric Properties

“…Furthermore, Figure and Table show that the Stokes shift of these molecules is lowered with a decrease of size, and the values of Stokes shift range from 18.9 to 27 nm. These results may introduce CNH-4 and CNH-2 molecules as promising candidates for encryption and medical applications. , …”

“…These results may introduce CNH-4 and CNH-2 molecules as promising candidates for encryption and medical applications. 78,79 One of the most important parameters in optoelectronic applications is the emission oscillator strength ( f em ). 80 Theoretically, for a given PL material, f em is directly proportional to the emission cross section (σ em ), which is given by 81…”

“…These results may introduce CNH-4 and CNH-2 molecules as promising candidates for encryption and medical applications. 78 , 79 …”

Theoretical and modelling investigation of pendant groups effect on quantum interference for single-molecule junctions

“…These results may introduce OPE-5 molecule as a promise candidate for the encryption and medical applications. 67,68 One of the most important parameters in optoelectronics applications is the emission oscillator strength ( f em ). 69 Theoretically, for a given PL material, f em is directly proportional to the emission cross section ( σ em ) and it is given by: 70 where e is the electron charge, ε 0 is the vacuum permittivity, m e is the mass of electron, c 0 is the speed of light, n F is the refractive index of the gain material, ν is the frequency of the corresponding emission, and g ( ν ) is the normalized line shape function with ∫ g ( ν )d ν = 1.…”

Chiral‐Guest Induced Multicolor‐Tunable Circularly Polarized Room Temperature Phosphorescence

“…due to their long luminescence lifetime, low biological toxicity, and strong modifiability. [ 1–12 ] With the development of strategies such as introducing heavy atoms, molecular design engineering, and host–guest doping, a large number of organic materials with excellent phosphorescence properties have been developed. [ 13–20 ] Although the phosphorescence performance of organic materials has been greatly improved, constructing organic phosphorescence materials with special functionalities still faces great challenges.…”