The design and characterization of purely organic room‐temperature phosphorescent (RTP) materials for optoelectronic applications is currently the focus of research in the field of organic electronics. Particularly, with the merits of preparation controllability and modulation flexibility, host–guest material systems are encouraging candidates that can prepare high‐performance RTP materials. By regulating the interaction between host and guest molecules, it can effectively control the quantum efficiency, luminescent lifetime, and color of host–guest RTP materials, and even produce RTP emission with stimuli‐responsive features, holding tremendous potential in diverse applications such as encryption and anti‐counterfeiting, organic light‐emitting diodes, sensing, optical recording, etc. Here a roundup of rapid achievement in construction strategies, molecule systems, and diversity of applications of host–guest material systems is outlined. Intrinsic correlations between the molecular properties and a survey of recent significant advances in the development of host–guest RTP materials divided into three systems including rigid matrix, exciplex, and sensitization are presented. Providing an insightful understanding of host–guest RTP materials and offering a promising platform for high throughput screening of RTP systems with inherent advantages of simple material preparation, low‐cost, versatile resource, and controllably modulated properties for a wide range of applications is intended.
Organic
ultralong room temperature phosphorescence (OURTP) materials
having stimuli-responsive attributes have attracted great attention
due to their great potential in a wide variety of advanced applications.
It is of fundamental importance but challengeable to develop stimuli-responsive
OURTP materials, especially such materials with modulated optoelectronic
properties in a controlled manner probably due to the lack of an authentic
construction approach. Here, we propose an effective strategy for
OURTP materials with controllably regulated stimuli-responsive properties
by engineering the resonance linkage between flexible chain and phosphor
units. A quantitative parameter to demonstrate the stimuli-responsive
capacity is also established by the responsivity rate constant. The
designed OURTP materials demonstrate efficient photoactivated OURTP
with lifetimes up to 724 ms and tunable responsivity rate constants
ranging from 0.132 to 0.308 min–1 upon continuous
UV irradiation. Moreover, the applications of stimuli-responsive resonance
OURTP materials have been illustrated by the rewritable paper for
snapshot and Morse code for multiple information encryption. Our works,
which enable the accomplishment of OURTP materials capable of on-demand
manipulated optical properties, demonstrate a viable design to explore
smart OURTP materials, giving deep insights into the dynamically stimuli-responsive
process.
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