Highly efficient organic light emitting diodes fabricated by solution process with new hole transport materials cross-linked at 120 °C

Le, Thi Na; Kim, Haechan; Ramachandran, Elumalai; Kim, Jaekyum; Lee, Ji‐Hoon; Suh, Min Chul

doi:10.1016/j.cej.2023.144540

Cited by 8 publications

(10 citation statements)

References 51 publications

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“…In this study, space charge-limited current (SCLC) was employed to study the mobility of our synthesized HTMs The hole mobility of the HTMs was calculated by the SCLC method by preparing a hole-only device (HOD in device architecture of ITO/PEDOT:PSS (30 nm)/HTL (60 nm)/NPB (10 nm)/Al (100 nm). It was necessary to be cautious when choosing a conductive polymer such as PEDOT:PSS as a hole injection layer (HIL) because it will affect the calculated mobility. , In our current HODs, highly conductive PEDOT:PSS (Al 4083) was used for the HIL. Moreover, its thickness was ignored to obtain a more accurate mobility value.…”

Section: Resultsmentioning

confidence: 99%

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Low-Temperature Cross-Linkable Hole Transport Material Based on Carbazole Derivatives Design and Applications in Solution-Processed OLEDs

Zhou,

Li,

Tang

et al. 2024

Macromolecules

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Cross-linking is demonstrated to be an effective strategy to resolve the interface erosion problem facing solution process technique for large area commercial applications of organic electronics. However, most of the reported cross-linkable materials require a high temperature of over 150 °C, which is detrimental to device performance. In this study, an in situ cross-linking protocol is proposed based on a triphenylamine/carbazole core linked with a hexyl chain and styryl moiety, and a low cross-linking temperature down to 120 °C is achieved for the first time. The resultant thermally cross-linkable hole transportation molecules of TPA-VBCz and HTPA-VBCz possess high triplet energy levels of around 3.0 eV and high decomposition temperatures over 410 °C. The solution-processed hole transportation layer (HTL) is cured at 120 °C in 30 min to finish the cross-linking net structure. Applications of this HTL in solution-processed multilayer thermally delayed fluorescent green OLEDs are explored with significantly improved current efficiency up to 78.3 cd A–1 and external quantum efficiency of 24.6%.

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Section: Resultsmentioning

confidence: 99%

“…It was necessary to be cautious when choosing a conductive polymer such as PEDOT:PSS as a hole injection layer (HIL) because it will affect the calculated mobility. 40,41 In our current HODs, highly conductive PEDOT:PSS (Al 4083) was used for the HIL. Moreover, its thickness was ignored to obtain a more accurate mobility value.…”

Section: Dft Calculationmentioning

confidence: 99%

Low-Temperature Cross-Linkable Hole Transport Material Based on Carbazole Derivatives Design and Applications in Solution-Processed OLEDs

Zhou,

Li,

Tang

et al. 2024

Macromolecules

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show abstract

“…In contrast, high-molecular-weight polymers are widely studied and utilized as cross-linkable HTMs (x-HTMs) in s-OLEDs, with effective control of the cross-linking process and minimal impact on charge transport abilities. 15 Cross-linking can take place between side groups such as oxetane, 16,17 styrene, 18−20 and benzocyclobutene (BCB). 22−28 Styrene allows for rapid polymerization through a simple curing process.…”

Section: Introductionmentioning

confidence: 99%

“…However, traditional, unsubstituted BCB requires high temperatures over 250 °C for the cross-linking reaction . Therefore, the incorporation of electron-donating substituents in BCB, such as alkoxy groups, has been reported to efficiently lower the curing temperature. ,, …”

Section: Introductionmentioning

confidence: 99%

“…By using this low resistivity PEDOT:PSS (Al4083), the thickness d in eq 1 can also be regarded as the thickness of the HTL layer only. 15 The zero-field mobilities of PIF-TPD, PIF-F2PCz, and PIF-TPAPCz were extracted to be 9.10 × 10 −3 , 1.43 × 10 −3 , and 1.61 × 10 −2 cm 2 V −1 s −1 , respectively, as shown in Figure 6. Through the SCLC method, our copolymers demonstrate significantly higher mobilities than previously reported HTMs.…”

mentioning

confidence: 96%

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Boosting Hole Mobility: Indenofluorene-Arylamine Copolymers and Their Impact on Solution-Processed OLED Performance

Kim,

Ham,

et al. 2024

ACS Appl. Mater. Interfaces

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High‐Detectivity UV–Visible–NIR Broadband Polymer Photodetector with Polymer Charge Blocking Layer Cross‐Linked by Organic Photocrosslinker

Jung,

Nguyen,

Kim

et al. 2024

Adv Funct Materials

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Ultraviolet (UV), visible, and near‐infrared (NIR) broadband organic photodetectors are fabricated by sequential solution‐based thin film coatings of a polymer electron blocking layer (EBL) and a polymer photoactive layer. To avoid damage to a preceding polymer EBL during a subsequent solution‐based film coating of a polymer photoactive layer due to lack of solvent orthogonality, 2‐(((4‐azido‐2,3,5,6‐tetrafluorobenzoyl)oxy)methyl)−2‐ethylpropane‐1,3‐diyl bis(4‐azido‐2,3,5,6‐tetrafluorobenzoate) (FPA‐3F) is used as a novel organic cross‐linking agent activated by UV irradiation with a wavelength of 254 nm. Solution‐processed poly[N,N′‐bis(4‐butylphenyl)‐N,N′‐bis(phenyl)‐benzidine] (poly‐TPD) films, which are cross‐linked with a FPA‐3F photocrosslinker, are used for a preceding polymer EBL. A ternary blend film composed of PTB7‐Th, COi8DFIC, and PC71BM is used as a NIR‐sensitive organic photoactive layer with strong photosensitivity in multispectral (UV–visible–NIR) wavelengths of 300–1,050 nm. Poly‐TPD films are successfully cross‐linked even with a very small amount of 1 wt% FPA‐3F. Small amounts of FPA‐3F have little detrimental effect on the electrical and optoelectronic properties of the cross‐linked poly‐TPD EBL. Finally, organic NIR photodetectors with a poly‐TPD EBL cross‐linked by the small addition of FPA‐3F (1 wt%) show the detectivity values higher than 1 × 1012 Jones for the entire UV–visible–NIR wavelengths from 300 nm to 1050 nm, and the maximum detectivity values of 1.41 × 1013 Jones and 8.90 × 1012 Jones at the NIR wavelengths of 900 and 1000 nm, respectively.

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Highly efficient organic light emitting diodes fabricated by solution process with new hole transport materials cross-linked at 120 °C

Cited by 8 publications

References 51 publications

Low-Temperature Cross-Linkable Hole Transport Material Based on Carbazole Derivatives Design and Applications in Solution-Processed OLEDs

Low-Temperature Cross-Linkable Hole Transport Material Based on Carbazole Derivatives Design and Applications in Solution-Processed OLEDs

Boosting Hole Mobility: Indenofluorene-Arylamine Copolymers and Their Impact on Solution-Processed OLED Performance

High‐Detectivity UV–Visible–NIR Broadband Polymer Photodetector with Polymer Charge Blocking Layer Cross‐Linked by Organic Photocrosslinker

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