Highly Efficient and Robust Full‐Color Organic Afterglow through 2D Superlattices Embedment

Abstract

Purely organic afterglow (POA) originating from the slow radiative decay of stabilized triplet excited states has shown amazing potential in many fields. However, achieving highly stable POA with high phosphorescent quantum yield (PhQY) and long lifetime is still a formidable challenge owing to the intrinsically active and sensitive nature of triplet excitons. Here, triplet excitons of phosphors are protected and stabilized by embedding in tricomponent trihapto self‐assembled 2D hydrogen‐bonded superlattices, which not only enables deep‐blue POA with high PhQY (up to 65%), ultralong lifetime (over 1300 ms) and the highest figure‐of‐merit at room temperature, but also achieves excellent stability capable of resisting quenching effects of oxygen, solvent, pressure, light, and heat. In addition, the POA color is tuned from deep‐blue to red via efficient Förster resonance energy transfer from the deep‐blue POA emitters to the fluorophores. Moreover, with the high‐performance, robust, and full‐color POA materials, flexible anti‐counterfeit displays and direct‐current (DC)‐driven lifetime‐encrypted color Morse Code applications are facilely realized.

Realizing Color‐Tunable and Time‐Dependent Ultralong Afterglow Emission in Antimony‐Doped CsCdCl3 Metal Halide for Advanced Anti‐Counterfeiting and Information Encryption

“…[13][14][15] Classically, the afterglow emission in organic materials stems from the spin-forbidden transition of triplet excitons, which generally exhibits unsatisfactory luminous efficiency and short afterglow duration of less than a few seconds. [16][17][18] As a consequence, there is an urgent need to develop novel multi-functional materials that can be synthesized at low temperature and have both high afterglow strength and long afterglow duration.…”

High Color Stability Blue-to-Violet Room Temperature Phosphorescent Carbon Dot Composites with Ultralong Lifetime for Information Encryption

“…Room temperature phosphorescent (RTP) materials have a wide range of applications in information encryption, − bio-imaging, − optoelectronics, − and display and illumination, , owing to their unique afterglow phenomenon. Most of the conventional RTP materials are organic RTP materials.…”

Cucurbit[8]uril Confinement-Based Secondary Coassembly for High-Efficiency Phosphorescence Energy Transfer Behavior

“…To alleviate above issues, purely organic room-temperature phosphorescence (RTP) have drawn into the limelight by virtue of their intrinsic photophysical characteristics including long-lived excited states and large Stokes shifts. − Recently, supramolecular confinement strategy derived from multiple interactions can not only effectively induce phosphorescent generation and then boost its emission in both the solution and the solid state but also create assembled environment to perform the triplet-involved phosphorescence resonance energy transfer process. − Thus, the utilization of phosphors as donors stands for a kind of excellent alternatives for constructing afterglow luminescent supramolecular materials, which powerfully allows for the miscellaneous applications in information safety, − biorelated imaging, − and color-resolved display. , For example, Chen et al. reported a highly efficient deep-blue phosphorescence by incorporating trimesic acid into self-assembled 2D hydrogen-bonded superlattices, which further realized full-color afterglow displays via energy transfer by introducing different fluorescent dyes . George and co-workers reported an efficient organic–inorganic light-harvesting platform in water which successfully achieved delayed fluorescence through a delayed sensitization process .…”