Organic materials that exhibit thermally activated delayed fluorescence (TADF) are an attractive class of functional materials that have witnessed a booming development in recent years. Since Adachi et al. reported high-performance TADF-OLED devices in 2012, there have been many reports regarding the design and synthesis of new TADF luminogens, which have various molecular structures and are used for different applications. In this review, we summarize and discuss the latest progress concerning this rapidly developing research field, in which the majority of the reported TADF systems are discussed, along with their derived structure–property relationships, TADF mechanisms and applications. We hope that such a review provides a clear outlook of these novel functional materials for a broad range of scientists within different disciplinary areas and attracts more researchers to devote themselves to this interesting research field.

Recent advances in organic thermally activated delayed fluorescence materials.

The design and characterization of metal–organic complexes for optoelectronic applications is an active area of research. The metal–organic complex offers unique optical and electronic properties arising from the interplay between the inorganic metal and the organic ligand. The ability to modify chemical structure through control over metal–ligand interaction on a molecular level could directly impact the properties of the complex. When deposited in thin film form, this class of materials enable the fabrication of a wide variety of low-cost electronic and optoelectronic devices. These include light emitting diodes, solar cells, photodetectors, field-effect transistors as well as chemical and biological sensors. Here we present an overview of recent development in metal–organic complexes with controlled molecular structures and tunable properties. Advances in extending the control of molecular structures to solid materials for energy conversion and information technology applications will be highlighted.

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Recent progress in metal–organic complexes for optoelectronic applications

With the prospect of extremely fast manufacture of very low cost devices, organic electronics prepared by thin film processing techniques that are compatible with roll-to-roll (R2R) methods are presently receiving an increasing interest. Several technologies using organic thin films are at the point, where transfer from the laboratory to a more production-oriented environment is within reach. In this review, we aim at giving an overview of some of the R2R-compatible techniques that can be used in such a transfer, as well the current status of R2R application within some of the existing research fields such as organic photovoltaics, organic thin film transistors, light-emitting diodes, polymer electrolyte membrane fuel cells, and electrochromic devices. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

https://onlinelibrary.wiley.com/doi/pdf/10.1002/polb.23192

Roll‐to‐Roll fabrication of large area functional organic materials

Recently, organic fluorescent molecules harnessing the excited-state intramolecular proton transfer (ESIPT) process are drawing great attention due to their unique photophysical properties which facilitate novel optoelectronic applications. After a brief introduction to the ESIPT process and related photo-physical properties, molecular design strategies towards tailored emission are discussed in relation to their theoretical aspects. Subsequently, recent studies on advanced ESIPT molecules and their optoelectronic applications are surveyed, particularly focusing on chemical sensors, fluorescence imaging, proton transfer lasers, and organic light-emitting diodes (OLEDs).

Advanced Organic Optoelectronic Materials: Harnessing Excited-State Intramolecular Proton Transfer (ESIPT) Process

In recent years, semiconducting polymer nanoparticles have attracted considerable attention because of their outstanding characteristics as fluorescent probes These nanoparticles, which primarily consist of π-conjugated polymers and are called polymer dots (Pdots) when they exhibit small particle size and high brightness, have demonstrated utility in a wide range of applications such as fluorescence imaging and biosensing In this review, we summarize recent findings of the photophysical properties of Pdots which speak to the merits of these entities as fluorescent labels This review also highlights the surface functionalization and biomolecular conjugation of Pdots, and their applications in cellular labeling, in vivo imaging, single-particle tracking, biosensing, and drug delivery We discuss the relationship between the physical properties and performance, and evaluate the merits and limitations of the Pdot probes for certain imaging tasks and fluorescence assays We also tackle the current challenges of Pdots and share our perspective on the future directions of the field

/pdf/highly-fluorescent-semiconducting-polymer-dots-for-biology-35z1f3dydv.pdf

Highly fluorescent semiconducting polymer dots for biology and medicine.

Within organic optoelectronics, polymer light-emitting devices (PLEDs) are regarded as an important class of devices which can convert electricity into light as a result of radiative decay taking place in semiconducting polymers. Recently, much effort has been devoted to developing efficient white emitting PLEDs for their potential applications in next-generation flat-panel displays and solid-state lighting sources. In this tutorial review, we will summarize the advances in white emitting polymers and devices published up till April 2009 by major prestigious institutions in this field. Special attention is paid to the recent progress in highly efficient devices realized by doping an electrophosphorescent guest into a polymer host and other approaches. Also we will summarize the new strategies to realize white emission with simultaneous fluorescent and/or phosphorescent emission from a single polymer in which singlet and/or triplet chromophores are incorporated into the polymer side or main chain through a covalent bond.

Progress and perspective of polymer white light-emitting devices and materials

Blue light‐emitting hyperbranched polymers using fluorene‐co‐dibenzothiophene‐S,S‐dioxide as branches

The invention discloses a single-layer exciplex and a single-molecule exciplex white light-emitting polymer and preparation methods and application thereof in organic light-emitting diodes.Binary white light emitting can be achieved based on a device achieving blending of two blue light-emitting polymers.The single-layer exciplex capable of emitting white light has a very high application value.By means of molecular design, an appropriate electron donor and electron acceptor are introduced into a macromolecular chain respectively, an intramolecular exciplex is formed, and exciplex type single-molecule white light emitting is achieved.The preparation method of the single-layer exciplex type complementary white light-emitting device is simple, easy to perform and suitable for solution processing such as solution spin coating and ink-jet printing and has good practicability in application of the white organic light-emitting diodes.

Single-layer exciplex and single-molecule exciplex white light-emitting polymer and preparation methods and application thereof

The invention discloses a bipolar micromolecular luminescent material based on 4-(9H-carbazole-9-yl) aniline and a preparation method and application thereof The material is mainly characterized in that the 4-(9H-carbazole-9-yl) aniline is used as a hole transport center unit, and bipolar micromolecules with the 4-(9H-carbazole-9-yl) aniline as the center are obtained by selecting groups with an electron transmission function The bipolar micromolecules prepared through the method can be used for making a luminescent layer of an organic light emitting diode

Wei Yang

Papers

Progress and perspective of polymer white light-emitting devices and materials

Blue light‐emitting hyperbranched polymers using fluorene‐co‐dibenzothiophene‐S,S‐dioxide as branches

Single-layer exciplex and single-molecule exciplex white light-emitting polymer and preparation methods and application thereof

Bipolar micromolecular luminescent material based on 4-(9H-carbazole-9-yl) aniline and preparation method and application thereof

Progress and Perspective of Polymer White Light‐Emitting Devices and Materials