Effective management of intramolecular charge transfer to obtain from blue to violet-blue OLEDs based on a couple of phenanthrene isomers

Ouyang, Xinhua; Li, Xianglong; Zhang, Xingye; Islam, Amjad; Ge, Ziyi; Su, Shi‐Jian

doi:10.1016/j.dyepig.2015.06.036

Cited by 36 publications

(16 citation statements)

References 24 publications

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“…The meta‐ linkage was favorable for deep blue emission, but had negative effect on the EQE of the device . Similar conclusion could also be made in the experiment comparing 3′‐(phenanthren‐9‐yl)‐ N,N ‐diphenyl‐5′‐(1‐phenyl‐1 H ‐phenanthro[9,10‐ d ]imidazol‐2‐yl)‐[1,1′‐biphenyl]‐4‐amine (m‐PTPAPI) and 4′‐(1‐(4‐(phenanthren‐9‐yl)phenyl)‐1 H ‐phenanthro[9,10‐ d ]imidazol‐2‐yl)‐ N,N ‐diphenyl‐[1,1′‐biphenyl]‐4‐amine (p‐PTPAPI) possessing the same PPI and triphenylamine moieties …”

Section: Tadf Emitterssupporting

confidence: 71%

Recent Progress in High‐Efficiency Blue‐Light‐Emitting Materials for Organic Light‐Emitting Diodes

Byun

Kim

et al. 2017

Adv Funct Materials

500

263

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Organic light-emitting diodes (OLEDs) are increasingly used in displays replacing traditional flat panel displays; e.g., liquid crystal displays. Especially, the paradigm shifts in displays from rigid to flexible types accelerated the market change from liquid crystal displays to OLEDs. However, some critical issues must be resolved for expansion of OLED use, of which blue device performance is one of the most important. Therefore, recent OLED material development has focused on the design, synthesis and application of highefficiency and long-life blue emitters. Well-known blue fluorescent emitters have been modified to improve their efficiency and lifetime, and blue phosphorescent emitters are being investigated to overcome the lifetime issue. Recently, thermally activated delayed fluorescent emitters have received attention due to the potential of high-efficiency and long-living emitters. Therefore, it is timely to review the recent progress and future prospects of high-efficiency blue emitters. In this feature article, we summarize recent developments in blue fluorescent, phosphorescent and thermally activated delayed fluorescent emitters, and suggest key issues for each emitter and future development strategies.

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Section: Tadf Emitterssupporting

confidence: 71%

Recent Progress in High‐Efficiency Blue‐Light‐Emitting Materials for Organic Light‐Emitting Diodes

Byun

Kim

et al. 2017

Adv Funct Materials

500

263

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“…The steady state phosphorescent emission of 1 is recorded at 77 K in glassy THF, showing phosphorescent peak at 437 nm blended in fluorescence, corresponding to an ET1 of 2.83 eV. However, by directly exciting 2 and 3 with proper laser flash, the triplet emission were not accessible at the same experiment condition as can be seen inFigure 3band 3c, thereby time-resolved PL was carried out to measure the can only be detected by exciting at 550 nm laser flash using PtOEP as sensitizer[41]. The first vibrational peak of phosphorescence is 713 nm (1.74 eV) arising from the long conjugation axis of An[16,45].…”

mentioning

confidence: 99%

Highly efficient and stable pure blue nondoped organic light-emitting diodes at high luminance based on phenanthroimidazole-pyrene derivative enabled by triplei-triplet annihilation

et al. 2017

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To promote the application of organic light emitting diodes (OLEDs) in various areas, achieving high performance blue OLEDs with outstanding efficiencies at high luminance is still desired. Herein, we focus on realizing stable and highly efficient pure blue OLED capable of harvesting triplets via triplet-triplet annihilation (TTA). Three fused polycyclic aromatic substituents, naphthalene, pyrene and anthracene, are selected to construct phenanthroimidazole-functionalized molecules (1−3), among which pyrene and anthracene comprised ones display TTA characteristics in electroluminescence devices. High photoluminescence quantum efficiency of 57% is found in the neat film of emitter 2 from judicious molecular design. The nondoped OLED of 2 exhibits pure blue emission with CIE coordinates of (0.15, 0.14) and demonstrates a maximum external quantum efficiency (EQE) of 5.11%, stable EQE over 5% at luminance of 300~3000 cd m −2 , EQE of 4.76% at an ultrabright luminance of 10000 cd m −2 and a maximum luminance of 54300 cd m −2. Such great device performance are responsible for the appreciable TTA contribution substantially.

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“…They are considered interesting materials for photoluminescent applications [1,2]. They are known to exhibit good electrical and optical properties due to their unique photoluminescence (PL) and electroluminescence properties [3][4][5][6][7] and their ease of use in the fabrication of new sensors or nanostructured materials. Among other distinctive properties of phenanthrenes are their higher thermal stability, lower toxicity than other polyaromatic systems, and their ready functionalization, which make them very desirable for applications in materials science [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photophysical properties of new reactive fluorophenanthrenes

Hajri¹,

Albalawi²,

Elsayed³

et al. 2020

Comptes Rendus. Chimie

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A series of six new suitably functionalized fluorophenanthrene derivatives were synthesized through a simple procedure, making use of inexpensive starting materials under mild conditions. The target phenanthrenes were characterized by 1 H and 13 C NMR and FT-IR spectroscopies. UV-Vis absorption and photoluminescence of these phenanthrenes were evaluated in solutions. A notable behavior and a strong fluorescence in the blue region of the visible spectrum were observed, making them potential candidates for organic light-emitting diode technology or advanced materials. Their electrochemical behavior was also experimentally examined in solution, demonstrating an important charge transfer interaction owing to their π-conjugated electronic system. Résumé. Une série de six nouveaux dérivés de fluorophénanathrène convenablement fonctionnalisés ont été synthétisés selon une procédure simple utilisant des réactifs peu coûteux dans des conditions douces. Les phénanthrènes cibles ont été caractérisés par RMN 1 H et 13 C et IR à transformée de Fourrier. L'étude de l'absorption UV-Vis et de la photoluminescence de ces phénanthrènes a été évaluée en solution montrant un comportement notable et une forte fluorescence dans la région bleue du spectre visible, ce qui permet de les considérer comme des candidats potentiels pour la technologie OLED ou des matériaux avancés. Leur comportement électrochimique a été aussi examiné expérimentalement en solution démontrant une interaction de transfert de charge importante grâce à leur système électronique π-conjugué.

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Effective management of intramolecular charge transfer to obtain from blue to violet-blue OLEDs based on a couple of phenanthrene isomers

Cited by 36 publications

References 24 publications

Recent Progress in High‐Efficiency Blue‐Light‐Emitting Materials for Organic Light‐Emitting Diodes

Recent Progress in High‐Efficiency Blue‐Light‐Emitting Materials for Organic Light‐Emitting Diodes

Highly efficient and stable pure blue nondoped organic light-emitting diodes at high luminance based on phenanthroimidazole-pyrene derivative enabled by triplei-triplet annihilation

Synthesis and photophysical properties of new reactive fluorophenanthrenes

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