This technology is currently under development by many industrial and academic research groups. Edge technology development headquarters, canon inc. Two novel 1,3,5triazine derivatives were used as effective host materials. It is similar to fluorescence, except that the chemical reactions within phosphorescent materials happen less often, thus they take longer to emit light.
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. 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. Both platinumii and iridiumiii are welldocumented to be outstanding phosphorescent materials for oleds with practical applications. Highly efficient simplestructure red phosphorescent oleds. Development of phosphorescent white oled with high power. High efficiency green phosphorescent oleds with long lifetime.
Highly efficient green and red phosphorescent oleds using. Operation and engineering of organic lightemitting diode oled devices. More than ten contributions cover all areas from theory and basic principles, to different emitter materials and applications in production. Consequently, high efficiency phosphorescent white oleds with a maximum eqe of 25. Phosphorescence is an effect in which some chemicals reemit light that they absorb. 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.
We investigated highly efficient green and red phosphorescent oleds. Advanced photonics journal of applied remote sensing. The high bipolar nature of the host is critical to this kind of doping system. 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 green solution processable organic light. Classroom resource material classroom resource materials art of. 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.
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. 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 by hartmut yersin. However, there are two main issues in the practical application of phosphorescent oleds pholeds. 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. Highly efficient red phosphorescent osmium ii complexes for oled applications article in organometallics 2315 july 2004 with 103 reads how we measure reads. Goldiii complexes are emerging as promising phosphorescent emitters for high efficiency organic lightemitting diodes oleds. Excimerbased white phosphorescent oleds with high efficiency. Origin and control of orientation of phosphorescent and tadf. Recently, however, an improvement of the lifetime of blue phosphorescent materials was reported.
The maximum current and power efficiency values of. Progress in smallmolecule luminescent materials for. 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. Efficient organic light emittingdiodes oleds crc press book. Here, we disclose the synthesis of a new phosphorescent. 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. Whilst efficient red and green emitters based upon phosphorescent organometallic emissive materials are available1, the development of deep blue emitters has remained a challenge. Since the triplet energy of blue phosphorescent dopant materials is, in general, 2. Tetradentate platinumii complexes for highly efficient. Front matter highly efficient oleds with phosphorescent. Blue phosphorescent host materials are required to achieve highly efficient lighting with white oleds, and many studies of such materials are underway. Like all types of oled, phosphorescent oleds emit light due to the electroluminescence of an organic semiconductor layer in an electric current. The 2014 journal of materials chemistry c hot articles. Phosphorescent organic lightemitting diode wikipedia.
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. For most fluorescent organic light emitting diodes oleds, the internal quantum efficiency. Classroom resource material classroom resource materials art of ancient egypt a resource for educators. In january 2008 sony announced the release of the first organic lightemitting diode oledbased television figure 1 into the u. Organic electroluminescent material, one of the centerpieces of oleds, has been the focus of studies by many material scientists. Phosphorescent iridium complexes akira tsuboyama leading. A highly stable and efficient organic light emitting device with a phosphorescent doped mixed layer architecture comprises an anode layer. Find a library or download libby an app by overdrive. 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. Read an excerpt chapter 01 pdf preface pdf table of contents pdf index pdf highly efficient oleds with phosphorescent materials. Highly efficient organic lightemitting diodes from. Recent progress in the use of fluorescent and phosphorescent.
Highly efficient singlestack hybrid cool white oled. Organic lightemitting diodes oleds have been extensively studied since the first efficient device based on small molecular luminescent materials was reported by tang. Pt1ptzbased sky blue organic lightemitting diode oled demonstrates a maximum external quantum efficiency eqe of 14. Highly efficient oleds with phosphorescent materials. Ultrahighefficiency solutionprocessed simplified small. 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. Highly efficient oleds with phosphorescent materials 1st edition by hartmut yersin editor 5. Frontiers recent advances in organic lightemitting. Highly efficient skyblue phosphorescent oleds were obtained when employing tpsif as the host and iridiumiii bis4,6difluorophenylpyridinaton,c 2. 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. Progress in smallmolecule luminescent materials for organic. The text covers in detail important areas such as topemission, p and ntype doping, device stability, light extraction, and stacked white 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. Also, phosphorescent materials necessitate dispersion into proper host materials with large band gaps to reduce the quenching effect of longlived triplet excitons.
Sn formation in host tn formation in host sn formation in dopant. Materials, devices and applications woodhead publishing series in electronic and optical materials book 36 kindle edition by buckley, alastair. To obtain high luminosity and to keep material costs low, a few. 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. Recent progress in high efficiency blue emitter materials for. Us20020074935a1 highly stable and efficient oleds with a. In this paper, after some general considerations, an overview of materials and device structures is presented with particular focus on electroluminescence ef. Strategic design, photophysics, and applications yun chi and pitai chou 6. Keywords phosphorescent, ptii porphyrin, oled, triplet, external quantum efficiency. Conference proceedings papers presentations journals. Highly efficient oleds with phosphorescent materials edition 1 available in hardcover. Indolo acridinebased holetransport materials for phosphorescent oleds with over 20% external quantum efficiency in deep blue and green. Thompson 4 highly effi cient red phosphorescent iridium complexes akira tsuboyama, shinjiro okada, and kazunori ueno 5 pyridyl azolate based luminescent complexes. Use features like bookmarks, note taking and highlighting while reading organic lightemitting diodes oleds.
Borrow ebooks, audiobooks, and videos from thousands of public libraries worldwide. Highly efficient oleds with phosphorescent materials solid. After introducing the fundamentals, it discusses more efficient oled designs, as well as advanced strategies to enhance the performance. The commercialization of high efficiency oleds is set to revolutionize lighting and display technologies in the near future. Highly efficient orangeemitting oleds based on phosphorescent platinumii complexes article in polyhedron 248. Highly efficient and stable phosphorescent organic light. 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. A versatile efficient onestep approach for carbazolepyridine hybrid molecules. 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. Highly efficient and stable organic lightemitting diodes. 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.
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. Highenergy excited state manager materials for longlived blue phosphorescent organic lightemitting diodes, disclosed 101915,u. However, despite recent advances in the coordination and organometallic chemistry of gold, only few compounds have been successful in highperformance devices. Lai, and chiming che 8 energytransfer processes between phosphorescent guest and fluorescent host molecules in phosphorescent oleds isao tanaka and. In this work, we developed high performance blue phosphorescent oleds by using a stacked emitting structure to get highly efficient white oleds. Download it once and read it on your kindle device, pc, phones or tablets. Kippelen center for organic photonics and electronics cope, school of. Highly efficient oleds with phosphorescent materials edited by hartmut yersin university of regensburg, germany, wileyvch, weinheim, germany, 2007, 458 pages, isbn 9783527405947. Highly efficient oleds with phosphorescent materials yersin, hartmut on. Highly efficient oleds with phosphorescent materials by.
The efficiency of oleds has been improved markedly by employing phosphorescent emitters. Lai, and chiming che 8 energytransfer processes between phosphorescent guest and fluorescent host molecules in phosphorescent oleds isao tanaka and shizuo tokito. 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. Highly efficient oleds with phosphorescent materials 1st.
Highly efficient oleds with phosphorescent materials book. Idemitsu kosan and toray industries announced that the companies have jointly developed a red oled device that is the worlds most efficient emitter at 46 cda. Holeelectron recombination, aka exciton formation reineke, s baldo, m. Abstract highly efficient red phosphorescent oleds pholeds with a simple, organic, triple. Suitable energy level is beneficial to efficient hosttoguest energy transfer. Review organic lightemitting diode oled technology. Highly efficient singlestack hybrid cool white organic lightemitting diodes oleds having blueyellowblue multiple emitting layers. 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. Novel host material for highly efficient blue phosphorescent. Design of new phosphorescent oled materials chemviews. Third generation organic light emitting materials for use in. Highly efficient nondoped blue fluorescent oleds with low.
Host and chargetransport materials for highefficiency deep. China abstract series of novel phosphorescent materiaslpossesses high pl efficiency in solid state, wellmatched energy levels with. Us6803720b2 highly stable and efficient oleds with a. Highly efficient oleds with phosphorecent materials. 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. 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. Journal of materials chemistry c royal society of chemistry. Highly efficient inverted organic lightemitting diodes. Supporting information materials for blue phosphorescent oleds. 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. Highly efficient all phosphorescent white organic light. Highly efficient inverted topemitting green phosphorescent organic lightemitting diodes on glass and flexible substrates e.
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. To obtain high luminosity and to keep material costs low, a few remarkable design concepts have. Nitrogen heterocyclecontaining materials for highly. Since their discovery, phosphorescent organic lightemitting diodes pholeds have been developed for more than ten years. Researchers develop metalfree efficient phosphorescence oleds. 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. The device uses a tadf emitter combined with red fluorescent materials which likely means this is a hyperfluorescence device. 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. Nowadays, phosphorescent materials are widely used to achieve highly efficient oleds because of their potential for achieving 100% internal quantum efficiency 6,7. This was a milestone in the development of materials that for over twenty years have been heralded as the successor to liquid crystal displays.
Highly efficient oleds with phosphorescent materials edition 1. 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. Novel phosphorescent materials with high and balanced. Journal of materials chemistry c rsc publishing home. 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. Details about highly efficient oleds with phosphorescent materials 1st edition by. Phosphorescent oleds with a structure of itomoo 3 hosthost. Stable, high efficiency white phosphorescent organic light. This work demonstrates that these tetradentate ptii complexes can act as efficient phosphorescent emitters for oled applications. 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. Highly efficient phosphorescent furo3,2cpyridine based. 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.
316 58 583 1115 437 614 1537 1502 228 1322 1401 1494 422 54 920 1274 61 928 611 985 1149 863 591 1454 702 323 1189 235 1200 872 1292 905