Efficient triplet harvesting of hybrid white organic light-emitting diodes using thermally activated delayed fluorescence green emitter

Lee, Song Eun; Lee, Ho Won; Baek, Hyun Jung; Yun, Tae Jun; Yun, Geum Jae; Kim, Woo Young; Kim, Young Kwan

doi:10.1117/1.jpe.6.042507

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…Additionally, a few papers have reported white emission from both hybrid 24, 25 and full TADF 26–30 structures, with one of the latter devices reporting a maximum efficiency of 19% 30 taking advantage of these materials’ high efficiencies and broad CT emission. Still, the challenge remains to find suitable TADF emitters and host materials that combine relatively low roll-off and high efficiency with stable optical and electrical properties, particularly for blue and red TADF materials.…”

Section: Introductionmentioning

confidence: 99%

“…In regards to W-OLEDs, devices with maximum external quantum efficiencies (ƞ ext ) above 20% have already been reported 5 , 6 using heavy, non-environmentally friendly and scarce materials while their complicated device structures imply increased production costs. Additionally, a few papers have reported white emission from both hybrid 24 , 25 and full TADF 26 – 30 structures, with one of the latter devices reporting a maximum efficiency of 19% 30 taking advantage of these materials’ high efficiencies and broad CT emission. Still, the challenge remains to find suitable TADF emitters and host materials that combine relatively low roll-off and high efficiency with stable optical and electrical properties, particularly for blue and red TADF materials.…”

Section: Introductionmentioning

confidence: 99%

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An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes

Pereira

Santos

Ward

et al. 2017

Sci Rep

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We report on the engineering of full thermally activated delayed fluorescence – based white organic light emitting diodes (W-OLEDs) composed of three emitters (2,7-bis(9,9-dimethyl-acridin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DDMA-TXO2), 2,7-bis(phenoxazin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DPO-TXO2) and 3,11-di(10H-phenoxazin-10-yl)dibenzo[a,j]phenazine (POZ-DBPHZ) in two different hosts. By controlling the device design through the study of the emission of DDMA-TXO2 and DPO-TXO2, the behaviour of POZ-DBPHZ in a device with more than one emitter, and the combination of the three materials, respectively, we show that external quantum efficiencies as high as 16% can be obtained for a structure with a correlated colour temperature close to warm white, together with colour rendering index close to 80. However it is in their performance stability that provides the true breakthrough: at 1000 cd/m2 the efficiencies were still above 10%, which is one of the best for this type of devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes

Pereira

Santos

Ward

et al. 2017

Sci Rep

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“…Also, it is necessary for WOLEDs to achieve appropriate white emission mixing with primary three colors (red, green, and blue) or two complimentary colors (blue and yellow or orange). Generally, WOLEDs have been reported, the host‐dopant doped type system using fluorescent or phosphorescent dopant . Several possibilities forming white light from OLEDs have been suggested, using all fluorescent systems, all‐phosphorescent systems, and hybrid systems considering dopants in EML.…”

Section: Introductionmentioning

confidence: 99%

White Organic Light‐Emitting Diodes Using Exciplex Emission with Multiple Emitting Layers

Baek

Lee

et al. 2017

Physica Status Solidi (a)

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In this paper, multiple‐exciplexed white organic light‐emitting diodes (WOLEDs) with blue and yellow–green emitting layers (EMLs) to improve charge balance and efficiency roll‐off through exciton confinement are investigated. Several types of WOLEDs are fabricated a number of including exciplex generated by only host materials without fluorescent or phosphorescent dopant. Moreover, various multiple exciplex can control electrical behavior of holes and electrons in whole EML. The performance improvement by the insertion of multi‐EMLs is realized throughout enhancement of exciton confinement and the reduced exciton quenching in EML. Efficiency roll‐off was 40% improved comparing to WOLED without multi‐EMLs and also color rendering index was achieved higher than 70 at 1000 cd m−2 in WOLED with multi‐EMLs.

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WOLEDs using TADF dopants

Duan

2022

Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes (TADF-OLEDs)

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Efficient triplet harvesting of hybrid white organic light-emitting diodes using thermally activated delayed fluorescence green emitter

Cited by 3 publications

References 21 publications

An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes

An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes

White Organic Light‐Emitting Diodes Using Exciplex Emission with Multiple Emitting Layers

WOLEDs using TADF dopants

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