Recent progress in the use of fluorescent and phosphorescent. Journal of materials chemistry c royal society of chemistry. Tetradentate platinumii complexes for highly efficient. Organic electroluminescent material, one of the centerpieces of oleds, has been the focus of studies by many material scientists. The efficiency of oleds has been improved markedly by employing phosphorescent emitters. Thompson 4 highly effi cient red phosphorescent iridium complexes akira tsuboyama, shinjiro okada, and kazunori ueno 5 pyridyl azolate based luminescent complexes. Highly efficient singlestack hybrid cool white oled.
The freedom of molecular design led to the production of an ultimate emitter that realizes both high efficiency and low cost without using rare metals. Development of phosphorescent white oled with high power. Details about highly efficient oleds with phosphorescent materials 1st edition by. Electrons and holes are injected into the organic layer at the electrodes and form excitons, a bound state of the electron and hole electrons and holes are both fermions with half integer spin. Highly efficient oleds have recently been realized without the use of heavy atoms by employing a tadf material as emitter 45, and it has also been found that the amount of the phosphorescent emitter used in the pholed can be significantly decreased by employing a tadf material with an intramolecular donoracceptor structure as the host. Materials, devices and applications woodhead publishing series in electronic and optical materials book 36 kindle edition by buckley, alastair. Highly efficient oleds with phosphorescent materials edition 1. Supporting information materials for blue phosphorescent oleds. The commercialization of high efficiency oleds is set to revolutionize lighting and display technologies in the near future. Since their discovery, phosphorescent organic lightemitting diodes pholeds have been developed for more than ten years. Highly efficient oleds with phosphorecent materials this brandnew monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this rapidly growing field. Frontiers recent advances in organic lightemitting.
Novel phosphorescent materials with high and balanced. Phosphorescence is an effect in which some chemicals reemit light that they absorb. Review organic lightemitting diode oled technology. Holeelectron recombination, aka exciton formation reineke, s baldo, m. Researchers develop metalfree efficient phosphorescence oleds. Highly efficient red phosphorescent oleds pholeds with a simple, organic, triplelayer structure was developed using the narrowbandgap fluorescent host material bis10hydroxybenzoh quinolinatoberyllium complex bebq2 and the deepred dopant tris1phenylisoquinolineiridium irpiq3. Phosphorescent oleds with a structure of itomoo 3 hosthost. Highly efficient host materials for blue phosphorescent oleds timeofflightchao tang, ran bi, youtian tao, fangfang wang, xudong cao, shifan wang, tao jiang, cheng zhong, hongmei zhang, and wei huang experimental general information. Conference proceedings papers presentations journals. Green inverted organic lightemitting diodes oleds based on a thermally activated delayed fluorescent tadf emitter, 2pheyl4carbazole9hthioxanthen9one10,10dioxide, with a cathode of indium tin oxide itozno injecting electrons efficiently into the electron transporting layer of alq3, are demonstrated for the first time. Download it once and read it on your kindle device, pc, phones or tablets. Since the triplet energy of blue phosphorescent dopant materials is, in general, 2. China abstract series of novel phosphorescent materiaslpossesses high pl efficiency in solid state, wellmatched energy levels with.
The device uses a tadf emitter combined with red fluorescent materials which likely means this is a hyperfluorescence device. Highly efficient green solution processable organic light. Highly efficient and stable phosphorescent organic light. Advanced photonics journal of applied remote sensing. This new monograph on oleds joins a small but growing number of books on the subject, including a 2006 publication from wileyvch entitled organic light emitting devices. Highly efficient oleds with phosphorescent materials. A series of highly efficient phosphorescent ir complexes with tunable emission colors over the whole visible range have been designed and synthesized based on furo3,2cpyridine ligand. This brandnew monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this rapidly growing field. Nitrogen heterocyclecontaining materials for highly. Borrow ebooks, audiobooks, and videos from thousands of public libraries worldwide. This brandnew release 211207 monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this rapidly growing field.
Use features like bookmarks, note taking and highlighting while reading organic lightemitting diodes oleds. Sep 15, 2014 in this paper, we describe the development of high efficiency deep blue phosphorescent organic light emitting diodes using high triplet energy host and charge transport materials. Phosphorescent iridium complexes akira tsuboyama leading. Consequently, high efficiency phosphorescent white oleds with a maximum eqe of 25. This work demonstrates that these tetradentate ptii complexes can act as efficient phosphorescent emitters for oled applications. Front matter highly efficient oleds with phosphorescent. Host and chargetransport materials for highefficiency deep. Keywords phosphorescent, ptii porphyrin, oled, triplet, external quantum efficiency. Highly efficient oleds with phosphorescent materials solid. Sn formation in host tn formation in host sn formation in dopant. Highly efficient oleds have recently been realized without the use of heavy atoms by employing a tadf material as emitter 45 and it has also been found that the amount of the phosphorescent. Highly efficient oleds with phosphorescent materials 1st edition by hartmut yersin editor 5. Materials, photophysics, and device physics, abstract currently, organic lightemitting diodes oleds have reached the stage of commercialization, and there has been an intense drive to use them in various applications from smalland mediumsized mobile devices to illumination equipment and. Nov 14, 20 researchers develop metalfree efficient phosphorescence oleds reseachers from the universities of bonn, regensburg, utah and the mit developed a new method to make triplets radiate directly in oleds rather than harvesting the triplets by reverse intersystem crossing to generate delayed fluorescence.
May 18, 2015 highly efficient oleds have recently been realized without the use of heavy atoms by employing a tadf material as emitter 45 and it has also been found that the amount of the phosphorescent. Here, we disclose the synthesis of a new phosphorescent. Classroom resource material classroom resource materials art of. Operation and engineering of organic lightemitting diode oled devices. Highly efficient phosphorescent furo3,2cpyridine based. Organic lightemitting diodes oleds have been extensively studied since the first efficient device based on small molecular luminescent materials was reported by tang. Highly efficient oleds with phosphorescent materials book.
Highly efficient singlestack hybrid cool white organic lightemitting diodes oleds having blueyellowblue multiple emitting layers. Recent progress in high efficiency blue emitter materials for. High efficiency green phosphorescent oleds with long lifetime. Highly efficient simplestructure red phosphorescent oleds. Novel host material for highly efficient blue phosphorescent. Us6803720b2 highly stable and efficient oleds with a. The text covers in detail important areas such as topemission, p and ntype doping, device stability, light extraction, and stacked white oleds. The origin and control of the orientation of phosphors are discussed, followed by a discussion of future strategies to achieve eqes of over 60% without a light extraction layer, from the material point. The actualization of highly efficient fullcolor and white organic lightemitting diodes oleds in a simple and unified device architecture using host materials that are suitable for red, green, and blue dopants has been quite a challenge. Highly efficient oleds with phosphorecent materials. To improve the electricitytolight conversion efficiency of pholeds, it is of great importance to improve their external quantum efficiency and to decrease their operating voltage. Phosphorescent organic lightemitting diodes pholed are a type of organic lightemitting diode oled that use the principle of phosphorescence to obtain higher internal efficiencies than fluorescent oleds.
A versatile efficient onestep approach for carbazolepyridine hybrid molecules. Ultrahighefficiency solutionprocessed simplified small. Highly efficient red phosphorescent osmium ii complexes for oled applications article in organometallics 2315 july 2004 with 103 reads how we measure reads. The larger difference between blue oleds with our host materials and those with tpbi than the differences between green and orangered oleds with our host materials and those with tpbi can be attributed to an additional origin. Highly efficient oleds with phosphorescent materials yersin, hartmut on.
Strategic design, photophysics, and applications yun chi and pitai chou 6. Highly efficient orangeemitting oleds based on phosphorescent platinumii complexes article in polyhedron 248. Us20020074935a1 highly stable and efficient oleds with a. However, there are two main issues in the practical application of phosphorescent oleds pholeds. Highly efficient inverted topemitting green phosphorescent organic lightemitting diodes on glass and flexible substrates e. Read an excerpt chapter 01 pdf preface pdf table of contents pdf index pdf highly efficient oleds with phosphorescent materials. Progress in smallmolecule luminescent materials for organic. Highly efficient nondoped blue fluorescent oleds with low.
Find a library or download libby an app by overdrive. In this work, we developed high performance blue phosphorescent oleds by using a stacked emitting structure to get highly efficient white oleds. Ideal hostguest system for emission in phosphorescent oleds with only 1% guest doping condition for efficient energy transfer have been demonstrated in the present investigation. It is similar to fluorescence, except that the chemical reactions within phosphorescent materials happen less often, thus they take longer to emit light. Highly efficient all phosphorescent white organic light. Recently, however, an improvement of the lifetime of blue phosphorescent materials was reported. Blue phosphorescent host materials are required to achieve highly efficient lighting with white oleds, and many studies of such materials are underway. Journal of materials chemistry c rsc publishing home. Highenergy excited state manager materials for longlived blue phosphorescent organic lightemitting diodes, disclosed 101915,u. Abstract highly efficient red phosphorescent oleds pholeds with a simple, organic, triple. Highly efficient inverted organic lightemitting diodes. The high bipolar nature of the host is critical to this kind of doping system. Highly efficient green and red phosphorescent oleds using.
Kippelen center for organic photonics and electronics cope, school of. Suitable energy level is beneficial to efficient hosttoguest energy transfer. Also, phosphorescent materials necessitate dispersion into proper host materials with large band gaps to reduce the quenching effect of longlived triplet excitons. Apr 23, 2015 organic lightemitting diodes oleds have been extensively studied since the first efficient device based on small molecular luminescent materials was reported by tang. Origin and control of orientation of phosphorescent and tadf. In january 2008 sony announced the release of the first organic lightemitting diode oledbased television figure 1 into the u. Currently, the efficiency and brightness of green oleds are good enough for industrial applications, but the performance of red and blue oleds in the context of color purity, efficiency, and brightness remain. Highly efficient oleds with phosphorescent materials edition 1 available in hardcover. By mainly varying the molecular structures of the cchelated blocks, the emission maxima of these complexes can be obviously tailored from 477 to 641 nm while keeping the considerable. Highly efficient oleds with phosphorescent materials by. Phosphorescent organic lightemitting diode wikipedia.
Whilst efficient red and green emitters based upon phosphorescent organometallic emissive materials are available1, the development of deep blue emitters has remained a challenge. Nowadays, phosphorescent materials are widely used to achieve highly efficient oleds because of their potential for achieving 100% internal quantum efficiency 6,7. Highly efficient oleds with phosphorescent materials edited by hartmut yersin university of regensburg, germany, wileyvch, weinheim, germany, 2007, 458 pages, isbn 9783527405947. Edge technology development headquarters, canon inc. Third generation organic light emitting materials for use in. The 2014 journal of materials chemistry c hot articles.
In this paper, after some general considerations, an overview of materials and device structures is presented with particular focus on electroluminescence ef. Stable, high efficiency white phosphorescent organic light. Excimerbased white phosphorescent oleds with high efficiency. Novel host material for highly efficient blue phosphorescent oleds pingi shih,a chenhan chien,a chuying chuang,a chingfong shu,a chenghan yang,b jianhong chenb and yun chib received 3rd november 2006, accepted 19th january 2007 first published as an advance article on the web 2nd february 2007 doi. This was a milestone in the development of materials that for over twenty years have been heralded as the successor to liquid crystal displays.
More than ten contributions cover all areas from theory and basic principles, to different emitter materials and applications in production. Highly efficient skyblue phosphorescent oleds were obtained when employing tpsif as the host and iridiumiii bis4,6difluorophenylpyridinaton,c 2. Goldiii complexes are emerging as promising phosphorescent emitters for high efficiency organic lightemitting diodes oleds. Progress in smallmolecule luminescent materials for. Like all types of oled, phosphorescent oleds emit light due to the electroluminescence of an organic semiconductor layer in an electric current. Lai, and chiming che 8 energytransfer processes between phosphorescent guest and fluorescent host molecules in phosphorescent oleds isao tanaka and. This monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this rapidly growing field. Highly efficient oleds with phosphorescent materials hartmut yersin this brandnew monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to. Lai, and chiming che 8 energytransfer processes between phosphorescent guest and fluorescent host molecules in phosphorescent oleds isao tanaka and shizuo tokito. Highly efficient oleds with phosphorescent materials 1st. A highly stable and efficient organic light emitting device with a phosphorescent doped mixed layer architecture comprises an anode layer.
Two novel 1,3,5triazine derivatives were used as effective host materials. Indolo acridinebased holetransport materials for phosphorescent oleds with over 20% external quantum efficiency in deep blue and green. Both platinumii and iridiumiii are welldocumented to be outstanding phosphorescent materials for oleds with practical applications. However, despite recent advances in the coordination and organometallic chemistry of gold, only few compounds have been successful in highperformance devices.
Highly efficient oleds with phosphorescent materials by hartmut yersin. Highly efficient organic lightemitting diodes from. This brandnew monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this. Efficient organic light emittingdiodes oleds crc press book. Highly efficient oleds with phosphorescent materials hartmut yersin this brandnew monograph on organic light emitting diodes, edited by a pioneer, and written by frontline researchers from academia and industry, provides access to the latest findings in this rapidly growing field. This technology is currently under development by many industrial and academic research groups. The maximum current and power efficiency values of. To obtain high luminosity and to keep material costs low, a few remarkable design concepts have. For most fluorescent organic light emitting diodes oleds, the internal quantum efficiency. For the fabrication of efficient phosphorescent oleds, the transition metal complex is typically used as emitting guest in a host material to avoid triplettriplet annihilation or quenching effects associated with the relatively long excited state lifetimes. Sep 02, 2008 we developed a novel host material, cheilgh01 reinforced with electron transporting property to perform high luminance efficiency and low driving voltage with long lifetime in green phosphorescent oled without hbl hole blocking layer. Pt1ptzbased sky blue organic lightemitting diode oled demonstrates a maximum external quantum efficiency eqe of 14.