High-efficiency blue organic light-emitting diodes using a 3,5-di(9H-carbazol-9-yl)tetraphenylsilane host via a solution-process

Jou, Jwo‐Huei; Wang, Wei-Ben; Chen, Sun-Zen; Shyue, Jing‐Jong; Hsu, Ming-Hung; Lin, Chengwei; Shen, Shengchun; Wang, Chun-Jan; Liu, Chi-Ping; Chen, Chin‐Ti; Wu, Min-Fei; Liu, Shun‐Wei

doi:10.1039/c0jm01163k

Cited by 122 publications

(49 citation statements)

References 36 publications

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“…There have been many papers reporting improved device performances in solution‐processed OLEDs and most research has been directed to enhancing the quantum efficiency using soluble triplet host and phosphorescent emitting materials . In most cases, a small‐molecule host and dopant materials for vacuum‐deposited phosphorescent organic light‐emitting diodes were modified or used without modification for application in solution‐processed devices, which improved the quantum efficiency of the solution‐processed phosphorescent OLEDs.…”

Section: Methodsmentioning

confidence: 99%

High Efficiency in a Solution‐Processed Thermally Activated Delayed‐Fluorescence Device Using a Delayed‐Fluorescence Emitting Material with Improved Solubility

2014

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Section: Methodsmentioning

confidence: 99%

High Efficiency in a Solution‐Processed Thermally Activated Delayed‐Fluorescence Device Using a Delayed‐Fluorescence Emitting Material with Improved Solubility

2014

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“…These small-molecule hosts could be great host materials in vacuum deposited device, however not be obtained approving EL performance in solution processed device. This is because these small-molecule hosts possess the lower glass transition temperature (T g ), lead to the occurrence of crystallization upon drying of emitting layer, thus cannot form a uniform amorphous thin film [80]. Therefore, to obtain better performance of EL device great needs to increase the T g for small-molecular hosts in solution processed device.…”

Section: Wet Processable Host Materials For Phosphorescent Oledmentioning

confidence: 99%

Materials for Organic Light Emitting Diode (OLED)

Karatsu

2014

Electronic Processes in Organic Electronics

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Iridium complexes have a wide range of applications such as photocatalysts to reduce carbon dioxide [1], imaging reagents for living cells [2], and oxygen sensors [3]. In particular, organic light emitting diodes (OLED) is one of important industrial application for iridium complexes, due to their high phosphorescent efficiency at ambient temperature [4,5]. OLEDs have many advantages, including self-emission (no backlight required), an almost 180 wide view angle, light weight, thin (<2 mm), quick response (1,000 times faster than LCD), high contrast, and can be fabricated on flexible plastic substrates.In 1987, Tan et al. reported the potential of OLEDs using tris (8-hydroxyquinolinato) aluminium (III) (Alq 3 ) [6]. Before them, the OLED device has simple configuration that has single organic crystal sandwiched by two electrodes. They introduced concept of OLED device configuration composed of multiple thin layers (Fig. 11.1). Here, each layer has an exact function, such as charge transporting and emitting abilities. The external efficiency of this OLED device was 1 %, which meant an internal efficiency of 5 %, because the output efficiency from the device was approximately 20 % [7]. After charge (hole and electron) injection into the emitting layer, 25 % singlet and 75 % triplet excitons are generated by charge recombination. Therefore, the only usable amount of fluorescence is 25 %. If phosphorescent materials can be used, then the 75 % triplet excitons are usable. In addition, the triplet excited state has lower energy than the singlet excited state; therefore, there is a chance that intersystem crossing of singlet excited state to the triplet excited state could occur.

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“…Tetraphenylsilane derivatives have been reported to be very effective in designing ultrahigh energy gap host molecules for blue PhOLEDs due to their inherently wide bandgap characteristics . Meanwhile, the highly twisted molecular configuration also endows tetraphenylsilane‐based derivatives with desired thermal stabilities and good solubilities for realizing uniform and smooth solution‐processible films . These features make them alluring candidates in constructing solution‐processed blue hosts.…”

Section: Device Performances Of Dczsi and Dsidczsi Hosted Blue Pholedsmentioning

confidence: 99%

Multiple σ–π Conjugated Molecules with Selectively Enhanced Electrical Performance for Efficient Solution‐Processed Blue Electrophosphorescence

Zhi

et al. 2019

Advanced Optical Materials

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Phosphorescent organic light-emitting diodes (PhOLEDs) have attracted intense attention owing to their theoretical 100% internal quantum efficiency through simultaneously utilizing singlet and triplet excitons. [1] With the tremendous efforts over the past few decades, the thermalevaporated electrophosphorescence devices with excellent external quantum efficiencies (EQEs) and operation lifetimes have been achieved. [2][3][4][5][6] Nevertheless, the development of high-efficiencies blue PhOLEDs remains as a daunting and forbidden challenge although blue emission is indispensable to improve color rendering index and color gamuts. [7][8][9][10][11][12] Moreover, the vacuum-deposited PhOLEDs require complicated technological processes and precisely controlling of concentrations of different materials in emission layer (EML) for realizing high device performance, which leads to relatively high fabrication costs. Solution-processed PhOLEDs based on spin-coating, blade coating and/or inkjet printing have been introduced with insistence because of their ultimate potential in facilitating largearea, low-cost, and high-efficiency flat-panel display as well as lighting products. [13,14] However, it is still quite difficult to develop solution-processed organic semiconductors simultaneously with the characteristics of good-solubility, large bandgap, and good carrier transportation for high-performance solutionprocessed blue PhOLEDs, which are fundamentally important for next-generation lighting sources and displays technologies.Commonly, the host-dopant systems are generally adopted to controllably eliminate the triplet-involved quench effects of emissive phosphors in the PhOLEDs. [15] The basic metrics of solution-processed hosts are excellent electrical property for endowing efficient and balanced carrier injection and flux, and high triplet energy (E T ) levels for maintaining exothermic energy migration from the hosts to dopants and confining the triplet excitons in EML. [16,17] Furthermore, additional requirements of hosts have to be simultaneously fulfilled to support high-efficiency solution-processed PhOLEDs: [18,19] i) good solubility in common organic solvent to fabricate stable, uniform and pin-hole free films, ii) high thermal and chemical stability to endow high temperature thermal annealing for eliminating Selectively and controllably regulating molecular functions of organic optoelectronic materials with high solubility for solution-processible devices is highly desired but remains as one of the most significant challenges in material science. Here, a concise molecular design strategy is reported to achieve effective electronic communications using efficient d-orbital participated σ-π conjugations between Si and π unit for purposely modulating the electrical properties of organic optoelectronic materials. Through a two-step reaction in high yield, DSiDCzSi with the enhanced σ-π conjugation is facilely constructed by introducing multiple triphenylsilanes into carbazole unit. Impressively, DSiD-CzSi demonstrates...

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High-efficiency blue organic light-emitting diodes using a 3,5-di(9H-carbazol-9-yl)tetraphenylsilane host via a solution-process

Cited by 122 publications

References 36 publications

High Efficiency in a Solution‐Processed Thermally Activated Delayed‐Fluorescence Device Using a Delayed‐Fluorescence Emitting Material with Improved Solubility

High Efficiency in a Solution‐Processed Thermally Activated Delayed‐Fluorescence Device Using a Delayed‐Fluorescence Emitting Material with Improved Solubility

Materials for Organic Light Emitting Diode (OLED)

Multiple σ–π Conjugated Molecules with Selectively Enhanced Electrical Performance for Efficient Solution‐Processed Blue Electrophosphorescence

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