Photo-activated time-dependent color-changeable ultralong organic room temperature phosphorescence by co-doping strategy

Abstract

In this work, we for the first time report photo-activated time-dependent color-changeable ultralong organic room temperature phosphorescence (UORTP) by co-doping derivatives (CN2BdBr and CN2BCzBr) of two phosphorescence units, H-Benzo[f]indole (Bd)...

Achieving time-dependent and color-tunable ultralong room temperature phosphorescence through sodiation reconfiguration for dynamic 5D information encryption

“…color (TDPC) has unique advantages in multi-level encryption modes and dynamic storage because it can provide an additional channel in the time dimension. 17–19 Common TDPC systems are designed by using a combination of different phosphorescent materials with diverse emission colors and lifetimes. 20,21 Achieving dynamic TDPC in a single material is still challenging as it requires RTP materials to have multiple emission characteristics with diverse decay times at a single excitation wavelength.…”

Naphthoic Acid Derivatives@Boric Acid Based Fast Photo‐Activated Room‐Temperature Phosphorescence Materials with Dynamic Changed Emission Color

“…At present, there are some strategies to achieve PAD‐URTP behavior, including oxygen‐consuming, changing the molecular configuration in crystal by UV light illumination and so on. [ 3,25–32 ] The previous one resulted from the conversion of the triplet state oxygen to singlet state oxygen upon UV light illumination so that the oxygen annihilation process was alleviated, which always require long irradiation time and extremely depends on the atmosphere conditions. [ 26,27 ] For the latter one, the increased phosphorescence intensity was attributed to switching the configuration of luminescent molecules within the crystal to the bright state under UV lamp excitation, which has advantages on extensive atmosphere conditions.…”

“…[ 3,25–32 ] The previous one resulted from the conversion of the triplet state oxygen to singlet state oxygen upon UV light illumination so that the oxygen annihilation process was alleviated, which always require long irradiation time and extremely depends on the atmosphere conditions. [ 26,27 ] For the latter one, the increased phosphorescence intensity was attributed to switching the configuration of luminescent molecules within the crystal to the bright state under UV lamp excitation, which has advantages on extensive atmosphere conditions. However, these molecules are in aggregated states in crystal and require long irradiation and deactivation time.…”

Color-tunable persistent luminescence in molecular polymorphs of ionic co-crystals

“…[4][5][6] However, high-efficiency low-molecular-weight RTP systems are still relatively limited because of their singlet state (S 0 ) to triplet state (T 1 ) spin forbidden process and relatively weak spin-orbital coupling (SOC). In order to promote the singlet-triplet intersystem crossing (ISC) processes and suppress nonradiative decay pathways, several methods including crystal engineering, 3,[7][8][9][10][11] hostguest doping, [12][13][14][15][16] H-aggregation, [17][18][19] heavy-atom effects, [20][21][22][23][24] and polymer assistance [25][26][27][28][29] have been developed to activate the RTP emission. Among them, crystal engineering is a promising approach that can achieve the control of crystalline solids with predictable properties.…”