OLED Display Fundamentals and Applications

Tsujimura, Takatoshi

doi:10.1002/9781119187493

Cited by 132 publications

(118 citation statements)

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confidence: 99%

“…[7] While OLED displays outperform their inorganic counterparts in terms of energy efficiency, [8] scientific and technical challenges concerning the stability and processability of the organic materials used in large-area OLEDs and organic solar cells remain. [8] Many of the remaining challenges are material related, e.g., the low mobility of charge carriers in organic materials in general and in amorphous organic semiconductors in particular. [8] Many of the remaining challenges are material related, e.g., the low mobility of charge carriers in organic materials in general and in amorphous organic semiconductors in particular.…”

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Toward Design of Novel Materials for Organic Electronics

et al. 2019

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organic/inorganic perovskites solar cells [6] to printable electronic circuits based on organic field-effect transistors (OFETs). [7] While OLED displays outperform their inorganic counterparts in terms of energy efficiency, [8] scientific and technical challenges concerning the stability and processability of the organic materials used in large-area OLEDs and organic solar cells remain. New challenges arise from applications, such as displays on flexible substrates, OLED lightning, large area displays as well as for printable or solution processable larger area solar cells. [8] Many of the remaining challenges are material related, e.g., the low mobility of charge carriers in organic materials in general and in amorphous organic semiconductors in particular. There are other materials related issues, such as limited OLED life times due to unstable blue hosts and emitters, [9] low fill factors, and therefore reduced power conversion efficiencies of organic solar cells, [10,11] low conductivity and high costs of organic charge transport layers of perovskite solar cells [6,12,13] and low conductivity and hard processability of crystalline OFET materials. [14] Conductivity and injection can be improved by doping the organic thin films with molecular dopants with high electron affinities (p-type) [15] or low ionization energies (n-type). [16] The doping mechanism of organic materials is in many cases not well understood, [17] making material and device optimization a costly experimental endeavor.The development of better materials is presently based on chemical insight, in part guided by theoretical understanding, or the experimental screening of large numbers of compounds. Given the size of the potentially available chemical space this remains a costly and time-consuming approach. Recent successes in experimental design of novel materials and concepts include the development of a stable strong molecular n-type dopant, [16] a study about the quantitative relation between interaction parameter, miscibility, and function of conjugated polymer donors and small-molecule acceptors for bulk heterojunctions as used in organic solar cells [18] the development of a universal strategy for ohmic hole injection into organic semiconductors with high ionization energies [19] and many others. [20][21][22][23][24][25] Another example is the development of strategies to harvest triplet excitons in organic light emitting diodes. For this purpose, novel classes of emitter molecules were developed, which include thermally activated delayed fluorescence (TADF)-based molecules, [26][27][28][29][30][31][32] rotationally accessed spin-state inversion, [33] and radical-based emitters. [34] Materials for organic electronics are presently used in prominent applications, such as displays in mobile devices, while being intensely researched for other purposes, such as organic photovoltaics, large-area devices, and thin-film transistors. Many of the challenges to improve and optimize these applications are material related and there is a nearly inf...

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Toward Design of Novel Materials for Organic Electronics

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“…5b), indicating little current-induced fluorescence quenching in the device. Noticeably, the CIE coordinates of the m-BBTPI-based device is (0.16, 0.06), which is very close to the standard blue coordinates of High-Definition Television (HDTV) (0.15, 0.06), 22 as shown in Fig. 5c.…”

Section: Electroluminescent Propertiesmentioning

confidence: 71%

A meta-molecular tailoring strategy towards an efficient violet-blue organic electroluminescent material

Chen

Yuan

et al. 2015

RSC Adv.

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In this paper, an efficient violet-blue emitter 4,4''-bis(1-(4-(tert-butyl)phenyl)-1H-phenanthro [9,10-d]imidazol-2-yl)-1,1':3',1''-terphenyl (m-BBTPI) was designed and synthesized by linking two phenanthroimidazole units via the meta position of a freely rotatable phenyl bridge. The present design provides a suitable level of conjugation between the two phenanthroimidazole units such that fluorescence is strengthened over the single unit while a violet-blue emission can be maintained by limiting the amount of redshift. The new emitter m-BBTPI is also found to have good thermal stability, strong violet-blue emission and bipolar charge transporting properties. An electroluminescent device using m-BBTPI as a non-doped emission layer shows a low turn-on voltage (3.2 V), good colour purity (0.16, 0.06) as well as high current and power efficiencies (1.99 cd A -1 , 1.81 lm W -1 ). These performance parameters are comparable to the state-of-the-art non-doped violet-blue OLEDs.

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“…The approach is easy to implement, because it can be fabricated with the same process as OLED display. However, red/green/blue colors can be mixed only when viewing distance is not very close . Also convex bending of OLED increases the primary color separation with this method.…”

Section: Introductionmentioning

confidence: 98%

Development of a color-tunable polychromatic organic-light-emitting-diode device for roll-to-roll manufacturing

Tsujimura

Hakii

Nakayama

et al. 2016

Jnl Soc Info Display

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-A flexible vertically stacked flexible polychromatic color-tunable OLED has been developed by means of low resistive intermediate electrode technology. The polychromatic OLED has a capability to show 16 million colors with 105% National Television Committee Standard (NTSC) color reproduction. The device can produce arbitrary shape with arbitrary colors, suitable for artistic expressions, just as many as those used in information displays. Independently controlled red, green, and blue lightemitting layers are stacked vertically. With conventional indium tin oxide technology, because of the temperature restriction, it was quite difficult to achieve low resistance on plastic substrate. The reported numbers were all more than 80 Ω/□. According to the surface mobility control using Fick's law analysis, low sheet resistance 7.34 Ω/□ on plastic film was developed. At first, flexible 7.17 cm 2 transparent OLED was fabricated for the performance confirmation of transparent electrode. And then polychromatic color-tunable OLED with the same size were successfully fabricated on plastic. With optical length optimization for each color stack of polychromatic OLED, more than 100% color reproduction in National Television Committee Standard was achieved by stack design. The polychromatic device can be used for colored illumination, as well as for organic-light-emitting display pixels for three times emission than conventional pixel design. The device is fabricated on plastic substrate so that the polychromatic organic-light-emitting-diode device is manufacturable with roll-to-roll production line.

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OLED Display Fundamentals and Applications

Cited by 132 publications

References 0 publications

Toward Design of Novel Materials for Organic Electronics

Toward Design of Novel Materials for Organic Electronics

A meta-molecular tailoring strategy towards an efficient violet-blue organic electroluminescent material

Development of a color-tunable polychromatic organic-light-emitting-diode device for roll-to-roll manufacturing

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