Highly Efficient and Direct Ultralong All‐Phosphorescence from Metal–Organic Framework Photonic Glasses

Abstract

Realizing efficient and ultralong room-temperature phosphorescence (RTP) is highly desirable but remains a challenge due to the inherent competition between excited state lifetime and photoluminescence quantum yield (PLQY). Herein, we report the bottomup self-assembly of transparent metal-organic framework (MOF) bulk glasses exhibiting direct ultralong allphosphorescence (lifetime: 630.15 ms) with a PLQY of up to 75 % at ambient conditions. These macroscopic MOF glasses have high Young's modulus and hardness, which provide a rigid environment to reduce nonradiative transitions and boost triplet excitons. Spectral technologies and theoretical calculations demonstrate the photoluminescence of MOF glasses is directly derived from the different triplet excited states, indicating the great capability for color-tunable afterglow emission. We further developed information storage and light-emitting devices based on the efficient and pure RTP of the fabricated MOF photonic glasses.

Construction of Artificial Light-Harvesting Systems Based on Aggregation-Induced Emission Type Supramolecular Self-Assembly Metallogels

“…As a solution to the energy crisis, we need to seek sustainable alternative energy sources. , As a form of clean and sustainable energy, solar energy has been attracting significant interest from the science and technology research community . To date, an increasing number of fields related to solar energy have emerged, including solar cell engineering, , photocatalysis, , luminescence chemistry, − bio-imaging, , and photodynamic therapy. − Additionally, through continuous observation and research, it has been established that plants capture, transfer, and store sunlight as chemical energy through photosynthesis. Inspired by photosynthesis, researchers have begun developing artificial light-harvesting systems (ALHSs) simulating photosynthesis to improve the utilization efficiency of solar energy.…”

“…2,3 As a form of clean and sustainable energy, solar energy has been attracting significant interest from the science and technology research community. 4 To date, an increasing number of fields related to solar energy have emerged, including solar cell engineering, 5,6 photocatalysis, 7,8 luminescence chemistry, 9−11 bio-imaging, 12,13 and photodynamic therapy. 14−16 Additionally, through continuous observation and research, it has been established that plants capture, transfer, and store sunlight as chemical energy through photosynthesis.…”

Metal-Halide Coordination Polymers with Excitation Wavelength- and Time-Dependent Ultralong Room-Temperature Phosphorescence

“…In addition to the pursuit of RTP materials with static ultralong lifetime and high efficiency, dynamic and tunable afterglow color is another important requirement for practical applications. − Recently, materials with tunable afterglow color have been successfully constructed, such as organic molecules, polymers, − carbon dots, and metal-based compounds − by changing excitation wavelength, temperature, and/or time evolution, which have large potential to apply in the fields of logic gates and anticounterfeiting. However, there is a lack of mature design and preparation methods so far, and particularly, the structure–RTP relationship and intrinsic mechanism are still unclear.…”

Color-Tunable Binary Copolymers Manipulated by Intramolecular Aggregation and Hydrogen Bonding

“…Color-tunable luminescent materials based on polymeric materials has been achieving increased attention, because of their processability, flexibility, and simple preparation process, which have played an important role in sensing, bioimaging, and information encryption. − The most common method to fabricate multicolored organic polymer luminescent materials was to polymerize chromophore monomers and/or modify chromophores to the as-prepared polymer backbones by post-modification. − However, these methods usually rely on multiple luminescent molecules attached to the polymers including dangling at side chains or located at polymer backbones to emit multicolor, which resulting in a tedious synthetic process. Therefore, construction of color-tunable polymeric luminescent materials based on single chromophore was highly desirable in the scope of polymer science and photochemistry. − Since the photophysical performance of chromophores were largely dependent on the packing state, − the main focus on construction multicolor luminescent materials was to regulate the aggregation state of luminescent molecules through covalent interactions and noncovalent interactions, such as covalent bonding, − host–guest interactions, − π–π interactions, − crystallization engineering, − hydrogen bonding, , etc.…”