Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes

Lin, Tzu‐Chieh; Sarma, Monima; Chen, Yi-Ting; Liu, Shih-Hung; Lin, Ke-Ting; Chiang, Pin-Yi; Chuang, Wei‐Tsung; Liu, Yichen; Hsu, Hsiu‐Fu; Hung, Wen‐Yi; Tang, Wei-Chieh; Wong, Ken‐Tsung; Chou, Pi‐Tai

doi:10.1038/s41467-018-05527-4

Cited by 121 publications

(55 citation statements)

References 28 publications

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“…The maximum EQE was 16% as shown in Figure 5(d). It is the same efficiency with the blue exciplex-emitting OLED with the emitting layer of CN-Cz2:PO-T2T mixtures which was reported in 2018 [72].…”

Section: Emitting Structure Composed Of a Donor And An Acceptorsupporting

confidence: 81%

Recent progress on exciplex-emitting OLEDs

Kim

2019

Journal of Information Display

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The thermally-activated-delayed-fluorescence (TADF) characteristics makes exciplexes being the hot subject in the organic light-emitting diode (OLED) research field. The theoretical limit for the efficiency of the conventional fluorescent OLEDs have been leaped by exploiting the triplet harvesting ability of exciplexes. Exciplexes are easily formed by blending electron donor molecules and electron acceptor molecules, which are generally hole transporting materials and electron transporting materials, respectively, resulting in easy access for employing exciplexes to OLEDs. We introduce the photo-physical characteristics of exciplexes derived from the charge-transfer characteristics and their application to OLEDs as emitters. Single exciplex-emitting OLEDs as well as exciplex emission-based white OLEDs are covered in this review.

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Section: Emitting Structure Composed Of a Donor And An Acceptorsupporting

confidence: 81%

Recent progress on exciplex-emitting OLEDs

Kim

2019

Journal of Information Display

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“…However, there is still a lack of understanding of the interaction between host materials and TADF polymer emitters. Furthermore, even though tremendous efforts have been put on intermolecular charge transfer state (CT-state) TADF (in the OLED community typically referred to as “exciplex”) between small molecules (Goushi et al, 2012; Liu et al, 2015; Wu et al, 2017; Lin et al, 2018a; Ullbrich et al, 2019), the first report of intermolecular CT-emission with TADF characteristics based on a non-TADF polymer (poly(9-vinylcarbazole), PVK) and small molecule (2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine, PO-T2T) was recently reported by Pander et al (2018). In their system, the concentration of small molecule component has only minor influence on the transient PL decay profile of the CT-emission.…”

Section: Introductionmentioning

confidence: 99%

Organic Light-Emitting Diodes Based on Conjugation-Induced Thermally Activated Delayed Fluorescence Polymers: Interplay Between Intra- and Intermolecular Charge Transfer States

Wei

Cao

et al. 2019

Front. Chem.

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In this work, interactions between different host materials and a blue TADF polymer named P1 are systematically investigated. In photoluminescence, the host can have substantial impact on the photoluminescence quantum yield (PLQY) and the intensity of delayed fluorescence (ΦDF), where more than three orders of magnitude difference of ΦDF in various hosts is observed, resulting from a polarity effect of the host material and energy transfer. Additionally, an intermolecular charge-transfer (CT) emission with pronounced TADF characteristics is observed between P1 and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), with a singlet-triplet splitting of 7 meV. It is noted that the contribution of harvested triplets in monochrome organic light-emitting diodes (OLEDs) correlates with ΦDF. For devices based on intermolecular CT-emission, the harvested triplets contribute ~90% to the internal quantum efficiency. The results demonstrate the vital importance of host materials on improving the PLQY and sensitizing ΦDF of TADF polymers for efficient devices. Solution-processed polychrome OLEDs with a color close to a white emission are presented, with the emission of intramolecular (P1) and intermolecular TADF (PO-T2T:P1).

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“…To verify this viewpoint, we then conducted the nanomicrosecond transient absorption measurement for the thin film of rac-BINAP with a step-scan Fourier-transform spectrometer 53,54 . The results, depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores

et al. 2020

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The correlation between molecular packing structure and its room-temperature phosphorescence (RTP), hence rational promotion of the intensity, remains unclear. We herein present racemism enhanced RTP chiral chromophores by 2,2-bis-(diphenylphosphino)-1,1-napthalene (rac-BINAP) in comparison to its chiral counterparts. The result shows that rac-BINAP in crystal with denser density, consistent with a long standing Wallach’s rule, exhibits deeper red RTP at 680 nm than that of the chiral counterparts. The cross packing between alternative R- and S- forms in rac-BINAP crystal significantly retards the bimolecular quenching pathway, triplet-triplet annihilation (TTA), and hence suppresses the non-radiative pathway, boosting the RTP intensity. The result extends the Wallach’s rule to the fundamental difference in chiral-photophysics. In electroluminescence, rac-BINAP exhibits more balanced fluorescence versus phosphorescence intensity by comparison with that of photoluminescence, rendering a white-light emission. The result paves an avenue en route for white-light organic light emitting diodes via full exploitation of intrinsic fluorescence and phosphorescence.

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Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes

Cited by 121 publications

References 28 publications

Recent progress on exciplex-emitting OLEDs

Recent progress on exciplex-emitting OLEDs

Organic Light-Emitting Diodes Based on Conjugation-Induced Thermally Activated Delayed Fluorescence Polymers: Interplay Between Intra- and Intermolecular Charge Transfer States

Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores

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