Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence

Zhang, Qisheng; Li, Bo; Huang, Shuping; Nomura, Hiroko; Tanaka, Hiroyuki; Adachi, Chihaya

doi:10.1038/nphoton.2014.12

Cited by 2,206 publications

(1,729 citation statements)

References 40 publications

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“…On the opposite, a lifetime of only one hour was found for a 9,10-dihydroacridine-based emitter 37 ( Figure 10) (the luminance of devices being 500 cd/m 2 ) [110]. Based on these different elements, it is still difficult to rationalize the molecular structure of a long-living deep blue TADF emitter [107][108][109][110]. …”

Section: Lifetime Of Blue Tadf Emittersmentioning

confidence: 99%

Thermally Activated Delayed Fluorescence Emitters for Deep Blue Organic Light Emitting Diodes: A Review of Recent Advances

et al. 2018

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Organic light-emitting diodes offer attractive perspectives for the next generation display and lighting technologies. The potential is huge and the list of potential applications is almost endless. So far, blue emitters still suffer from noticeably inferior electroluminescence performances in terms of efficiency, lifespan, color quality, and charge injection/transport when compared to that of the other colors. Emitting materials matching the NTSC standard blue of coordinates (0.14, 0.08) are extremely rare and still constitutes the focus of numerous academic and industrial researches. In this context, we review herein the recent developments on highly emissive deep-blue thermally activated delayed fluorescence emitters that constitute the third-generation electroluminescent materials.

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Section: Lifetime Of Blue Tadf Emittersmentioning

confidence: 99%

Thermally Activated Delayed Fluorescence Emitters for Deep Blue Organic Light Emitting Diodes: A Review of Recent Advances

et al. 2018

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“…OLEDs have been available in the commercial market and have achieved highly efficient performance of RGB (red-green-blue) color and white light displays. [6][7][8] OSCs and OLEDs with efficient and stable performance have been reported using different metal oxides as the electron and hole transport layers (ETLs and HTLs). Metal oxides with a high work function such as MoO 3 , 9,10 V 2 O 5 , 11 WO 3 12,13 and NiO x 14,15 can function as HTLs in organic optoelectronic devices to address the degradation issue of poly (3,4-ethylenedioythiophene):poly(styrenesulfonate) (PEDOT:PSS)-based devices.…”

Section: Introductionmentioning

confidence: 99%

MoOx and V2Ox as hole and electron transport layers through functionalized intercalation in normal and inverted organic optoelectronic devices

et al. 2015

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To achieve fabrication and cost competitiveness in organic optoelectronic devices that include organic solar cells (OSCs) and organic light-emitting diodes (OLEDs), it is desirable to have one type of material that can simultaneously function as both the electron and hole transport layers (ETLs and HTLs) of the organic devices in all device architectures (i.e., normal and inverted architectures). We address this issue by proposing and demonstrating Cs-intercalated metal oxides (with various Cs mole ratios) as both the ETL and HTL of an organic optoelectronic device with normal and inverted device architectures. Our results demonstrate that the new approach works well for widely used transition metal oxides of molybdenum oxide (MoO x ) and vanadium oxide (V 2 O x ). Moreover, the Cs-intercalated metaloxide-based ETL and HTL can be easily formed under the conditions of a room temperature, water-free and solution-based process. These conditions favor practical applications of OSCs and OLEDs. Notably, with the analyses of the Kelvin Probe System, our approach of Cs-intercalated metal oxides with a wide mole ratio range of transition metals (Mo or V)/Cs from 1 : 0 to 1 : 0.75 can offer significant and continuous work function tuning as large as 1.31 eV for functioning as both an ETL and HTL. Consequently, our method of intercalated metal oxides can contribute to the emerging large-scale and low-cost organic optoelectronic devices.

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“…However, blue OLEDs still suffer from much shorter lifetimes than green and red ones [4,5], even though pure blue light emitters have demonstrated over 20% EQE for phosphorescent materials [6,7] and nearly 20% for thermally activated delayed fluorescence (TADF) molecules [8]. Dendrimer-based OLEDs have been investigated in the last two decades, due to their numerous advantages over small molecules and polymers, i.e., cost-effective solution processability, high performance reproducibility thanks to their well-defined structures, in contrast to polymers, and precise functionalization of dendrimers at multiple positions [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Blue Light Emitting Polyphenylene Dendrimers with Bipolar Charge Transport Moieties

et al. 2016

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Two light-emitting polyphenylene dendrimers with both hole and electron transporting moieties were synthesized and characterized. Both molecules exhibited pure blue emission solely from the pyrene core and efficient surface-to-core energy transfers when characterized in a nonpolar environment. In particular, the carbazole-and oxadiazole-functionalized dendrimer (D1) manifested a pure blue emission from the pyrene core without showing intramolecular charge transfer (ICT) in environments with increasing polarity. On the other hand, the triphenylamine-and oxadiazole-functionalized one (D2) displayed notable ICT with dual emission from both the core and an ICT state in highly polar solvents. D1, in a three-layer organic light emitting diode (OLED) by solution processing gave a pure blue emission with Commission Internationale de l'Éclairage 1931 CIE xy = (0.16, 0.12), a peak current efficiency of 0.21 cd/A and a peak luminance of 2700 cd/m 2 . This represents the first reported pure blue dendrimer emitter with bipolar charge transport and surface-to-core energy transfer in OLEDs.

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Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence

Cited by 2,206 publications

References 40 publications

Thermally Activated Delayed Fluorescence Emitters for Deep Blue Organic Light Emitting Diodes: A Review of Recent Advances

Thermally Activated Delayed Fluorescence Emitters for Deep Blue Organic Light Emitting Diodes: A Review of Recent Advances

MoOx and V2Ox as hole and electron transport layers through functionalized intercalation in normal and inverted organic optoelectronic devices

Blue Light Emitting Polyphenylene Dendrimers with Bipolar Charge Transport Moieties

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