22.1: <i>Invited Paper</i>: New Fluorescent Blue Host Materials for Achieving Low Voltage in OLEDs

Okinaka, Keiji; Ikeda, Takeshi; Mitsuya, Masayuki; Saito, Hiroyuki; Ito, Hirokatsu; Kawamura, Masahiro; Kuma, Hitoshi

doi:10.1002/sdtp.10480

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In order to enhance TTF efficiently, it is important to generate excitons locally to increase the exciton density. However, the previous studies have shown that excess carriers quench the localized triplet excitons and inhibit TTF 9,19 . It was also considered that locally increased high exciton density had an adverse effect on the device lifetime.…”

Section: Resultsmentioning

confidence: 99%

“…However, the previous studies have shown that excess carriers quench the localized triplet excitons and inhibit TTF. 9,19 It was also considered that locally increased high exciton density had an adverse effect on the device lifetime.…”

Section: Concept Of Bilayer Emlmentioning

confidence: 99%

“…We have reported that efficiency‐enhancement layer with high triplet energy for also working as triplet‐blocking layer was inserted as an adjacent layer of the emitting layer (EML) 8 . Improvements of the EML have also been reported, for example, enhancement of electron mobility in EML, 9 or stacked EML using host materials with different triplet energies 10,11 . In the design of blue dopants (BDs), the orientation of BDs' transition dipole parallel to the substrates can improve the light extraction efficiency 12–15 .…”

Section: Introductionmentioning

confidence: 99%

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Realization of ultra‐high‐efficient fluorescent blue OLED

et al. 2022

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The bilayer structure for an emitting layer (EML) was developed to improve performances of a fluorescence blue organic light emitting diode. By functionally separating the EML into the charge recombination and the triplet–triplet fusion (TTF) zone, we successfully suppressed the quenching of triplet excitons by excess carriers to make more TTF efficient and the local degradation within the EML to make the lifetime longer. In the bottom emission device with the bilayer EML, 12% of external quantum efficiency (EQE) and 450 h of LT95 were achieved. Furthermore, we achieved over 14% of EQE by optimizing the material combinations.

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Section: Resultsmentioning

confidence: 99%

Section: Concept Of Bilayer Emlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Realization of ultra‐high‐efficient fluorescent blue OLED

et al. 2022

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“…In order to enhance TTF efficiently, it is important to generate excitons locally to increase the exciton density. However, the previous studies have shown that excess carriers quench the localized triplet excitons and inhibit TTF [5], [6]. It was also considered that locally increased high exciton density had an adverse effect on the device lifetime.…”

Section: -1 Concept Of Bilayer Emlmentioning

confidence: 99%

40‐3: Distinguished Paper: Realization of Ultra‐High Efficient Fluorescent Blue OLED

Tasaki

Nishimura

Toyoshima

et al. 2022

Symp Digest of Tech Papers

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The bilayer structure for an emitting layer (EML) was developed to improve performances of a fluorescence blue organic light emitting diode. By functionally separating the EML into the charge recombination and the Triplet‐Triplet Fusion (TTF) zone, we successfully suppressed the quenching of triplet excitons by excess carriers to make more TTF efficient and the local degradation within the EML to make the lifetime longer. In the bottom emission device with the bilayer EML, 12% of external quantum efficiency (EQE) and 450 hours of LT95 were achieved. Furthermore, we achieved over 14% of EQE by optimizing the material combinations.

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Highly efficient fluorescent blue materials and their applications for top‐emission OLEDs

et al. 2018

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We developed new fluorescent blue dopants (BDs) for achieving high-efficient blue organic light-emitting diode. A new BD showed both high photoluminescent quantum yield >0.9 and highly horizontal orientation (S 0 > 0.9) in doped film with keeping a chemical stability by introducing suitable substituents. We developed hole transporting materials and optimized the combination of hole transporting layers to decrease a carrier accumulation at the interface between electron blocking layer and emission layer. We found that the external quantum efficiency dependency from low to high current density was turned flat by promoting hole injection into emission layer. The top-emission organic lightemitting diode using the new BD and the optimized device architecture exhibited high efficiency of L/J/ CIEy around 200 at CIEy = 0.043.

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22.1: Invited Paper: New Fluorescent Blue Host Materials for Achieving Low Voltage in OLEDs

Cited by 5 publications

References 3 publications

Realization of ultra‐high‐efficient fluorescent blue OLED

Realization of ultra‐high‐efficient fluorescent blue OLED

40‐3: Distinguished Paper: Realization of Ultra‐High Efficient Fluorescent Blue OLED

Highly efficient fluorescent blue materials and their applications for top‐emission OLEDs

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