Multicolor Ultralong Organic Phosphorescence through Alkyl Engineering for 4D Coding Applications

Abstract

Luminogens with colorful ultralong organic phosphorescence (UOP) are in high demand because of various potential applications in optoelectronics. Herein, we report a concise approach to tune UOP based on the same chromophores of carbazole and phthalimide units through alkyl engineering. With flexible alkyl increase, UOP emission colors can be controllably tuned from green to orange along with lifetime variation. Furthermore, these phosphors were endowed with unexpected visible-light excitation, mechanochromism, and mechanoluminescence properties simultaneously. Additionally, colorful UOP with diverse emission lifetime was first applied to the 4D code for information encryption. These findings will open a door to explore multifunctional organic phosphorescence materials and expand their potential applications.

Stimuli‐Responsive Circularly Polarized Organic Ultralong Room Temperature Phosphorescence

“…Both, the pristine and photo‐activated dimers derived from single crystals have identical numbers of ISC channels and similar SOC values (Table S7). Therefore, the significantly improved CP‐OURTP performance should be ascribed to the photo‐enhanced aggregation coupling including H‐aggregation and intra/intermolecular interactions of the chiral molecules in solid state . H‐aggregation has been proved to be effective to stabilize the highly active triplet excitons by suppressing both the radiative and non‐radiative rates for OURTP (Figure c) .…”

“…Therefore,the significantly improved CP-OURTP performance should be ascribed to the photoenhanced aggregation coupling including H-aggregation and intra/intermolecular interactions of the chiral molecules in solid state. [31] H-aggregation has been proved to be effective to stabilize the highly active triplet excitons by suppressing both the radiative and non-radiative rates for OURTP Figure 3c). [32] Indeed, significant numbers of H-aggregation were observed in the pristine single-crystal ( Figure S21) with positive exciton splitting energies (De)r anging from 2.65 10 À5 to 2.81 10 À3 eV (Figure 3d and Table S9).…”

Wide‐Range Color‐Tunable Organic Phosphorescence Materials for Printable and Writable Security Inks

“…[6a,c-e] Tunable emission color endows RTPm aterials with superior performance in optoelectronic applications.F or instance,m ulticolor-encoded materials can serve as information carriers for encrypted data storage,highdensity,a nd anti-counterfeiting. [7] Furthermore,l ong wavelength RTPm aterials are ideal biomarkers for bioimaging. [8] To date,t he development of wide-range color-tunable emission RTPm aterials remains af ormidable challenge,w hich greatly limits application of multi-component phosphorescence materials.…”

Organic Room Temperature Phosphorescence Materials for Biomedical Applications

“…Organic phosphorescence, an electronic transition from the excited triplet state to the singlet ground state, has attracted increasing attention recently, owing to its long-lived triplet excitons and large Stokes shifts. [1] During past years, various phosphorecent materials have been widely applied in newly emerged technologies, such as data encryption and display, [2][3][4][5] molecule sensing and imaging, [6][7][8][9] organic light emitting diodes [10][11][12][13] and so forth. [14][15] Early researches on phosphorescent materials mainly focused on the metal-containing compounds, for example, europium, iridium and platinum-containing complexes.…”