Fabrication of high-efficiency multilayered organic light-emitting diodes by a film transfer method

Kawano, Kenji; Nagayoshi, Kaori; Yamaki, Takeyuki; Adachi, Chihaya

doi:10.1016/j.orgel.2014.04.035

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…Recently, the use of TADF has greatly expanded, with developments including OLEDs with promising operational stability [56], white OLEDs for application as a solid-state lighting source [31,57], assist dopants in highly efficient fluorescent OLEDs [58,59], controlling emitter orientation to enhance light-outcoupling efficiency [60][61][62], solution-processed OLEDs [63,64], a roll-to-roll process for low-cost OLEDs [65], highly efficient electrogenerated chemiluminescence [66], and time-resolved fluorescence cell imaging [67]. The recent progress in the application of TADF suggests that a paradigm shift from OLED dopants that exhibit normal fluorescence and phosphorescence to those that show TADF is currently occurring.…”

Section: Thermally Activated Delayed Fluorescence and Its Applicationmentioning

confidence: 99%

Highly efficient electroluminescence from purely organic donor–acceptor systems

Shizu

Lee

Tanaka

et al. 2015

Pure and Applied Chemistry

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Thermally activated delayed fluorescence (TADF) emitters are third-generation electroluminescent materials that realize highly efficient organic light-emitting diodes (OLEDs) without using rare metals. Here, after briefly reviewing the principles of TADF and its use in OLEDs, we report a sky-blue TADF emitter, 9-(4-(benzo[d]thiazol-2-yl)phenyl)-N 3 ,N 3 ,N 6 ,N 6 -tetraphenyl-9H-carbazole-3,6-diamine (DAC-BTZ). DAC-BTZ is a purely organic donor-acceptor-type molecule with a small energy difference between its lowest excited singlet state and lowest triplet state of 0.18-0.22 eV according to fluorescence and phosphorescence spectra of a DAC-BTZ-doped film. In addition, the doped film exhibits a high photoluminescence quantum yield of 0.82. Time-resolved photoluminescence measurements of the doped film confirm that DAC-BTZ emits TADF. An OLED containing DAC-BTZ as an emitter exhibits a maximum external quantum efficiency (EQE) of 10.3 %, which exceeds those obtained with conventional fluorescent emitters (5-7.5 %). TADF from DAC-BTZ makes a large contribution to the high EQE of its OLED.

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Section: Thermally Activated Delayed Fluorescence and Its Applicationmentioning

confidence: 99%

Highly efficient electroluminescence from purely organic donor–acceptor systems

Shizu

Lee

Tanaka

et al. 2015

Pure and Applied Chemistry

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“…[19][20][21][22] In this study, we develop a solution-processable TADF emitter, 2,4,6-tris(4-(9,9-dimethylacridan-10-yl)phenyl)-1,3,5-triazine (3ACR-TRZ, Fig. 1(a)).…”

mentioning

confidence: 99%

Highly efficient electroluminescence from a solution-processable thermally activated delayed fluorescence emitter

Wada

Shizu

Kubo

et al. 2015

Applied Physics Letters

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We developed a thermally activated delayed fluorescence (TADF) emitter, 2,4,6-tris(4-(9,9-dimethylacridan-10-yl)phenyl)-1,3,5-triazine (3ACR-TRZ), suitable for use in solution-processed organic light-emitting diodes (OLEDs). When doped into 4,4′-bis(carbazol-9-yl)biphenyl (CBP) host at 16 wt. %, 3ACR-TRZ showed a high photoluminescence quantum yield of 98%. Transient photoluminescence decay measurements of the 16 wt. % 3ACR-TRZ:CBP film confirmed that 3ACR-TRZ exhibits efficient TADF with a triplet-to-light conversion efficiency of 96%. This high conversion efficiency makes 3ACR-TRZ attractive as an emitting dopant in OLEDs. Using 3ACR-TRZ as an emitter, we fabricated a solution-processed OLED exhibiting a maximum external quantum efficiency of 18.6%.

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“…A high PLQY of above 90% and a relatively short excited-state lifetime of 5.1 μs for delayed emission were reported using the 4CzIPN emitter. After the demonstration of a high EQE close to 20% using the organic 4CzIPN TADF emitter for the first time, several works optimizing the device structure of the 4CzIPN TADF OLEDs followed and reported an improved EQE surpassing the EQE obtained by Adachi et al Several bipolar host materials with a triplet energy high enough for both the singlet and triplet harvesting of 4CzIPN were proven to be better than the carbazoletype host materials and provided EQEs higher than 20% [8][9][10][11][12][13][14][15][16][17]. In particular, 3-(3-(carbazole-9-yl)phenyl) pyrido [3 ,2 :4,5]furo [2,3-b]pyridine (3CzPFP) was the best host material of 4CzIPN and realized the best EQE of 31.2% in the 4CzIPN devices [6].…”

Section: Cyano (Cn)-modified Tadf Emittersmentioning

confidence: 99%

Recent progress of green thermally activated delayed fluorescent emitters

Lee

2017

Journal of Information Display

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Pure organic-based thermally activated delayed fluorescent (TADF) emitters have been studied for the last five years because of their potential as high-efficiency emitters comparable to phosphorescent emitters. Although the initial external quantum efficiency (EQE) of the TADF emitters was much lower than that of phosphorescent emitters, the current EQE of the TADF organic light-emitting diodes (OLEDs) is quite similar to that of phosphorescent OLEDs. In particular, the EQE of the green TADF OLEDs is already over 30% with the help of the new molecular design fully harvesting triplet excitons of the TADF emitters for light emission through the up-conversion process. In this work, the progress of the device performances of the TADF OLEDs was studied by reviewing the green TADF emitters that had been developed in the last five years. ARTICLE HISTORY

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Fabrication of high-efficiency multilayered organic light-emitting diodes by a film transfer method

Cited by 19 publications

References 26 publications

Highly efficient electroluminescence from purely organic donor–acceptor systems

Highly efficient electroluminescence from purely organic donor–acceptor systems

Highly efficient electroluminescence from a solution-processable thermally activated delayed fluorescence emitter

Recent progress of green thermally activated delayed fluorescent emitters

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