Hole-transporting polyimide for organic electroluminescent display

Kim, Youngkyoo; Lee, Jae-Gyoung; Han, Ki-Jong; Hwang, Ha-Keun; Choi, Dongkwon; Jung, Youngyi; Keum, Jihwan; Kim, Sunwook; Park, Seong‐Sik; Im, Woo-Bin

doi:10.1016/s0040-6090(99)01073-1

Cited by 21 publications

(14 citation statements)

References 26 publications

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“…The improved on/off ratio can be attributable to the better stacking of NPB molecules by thermal treatment so as to reduce the imperfections (pin holes etc.) However, the rearranged state of NPB molecules could be destroyed by thermal treatment at 120 °C, which is higher than the glass transition temperature of NPB (T g = ≈99 °C), [37][38][39] leading to the poor performance of corresponding OFETs (see Figure S5 in Supporting Information). [35,36] As expected from the transfer curves, the hole mobility (μ h ) was gradually increased as the NPB thickness increased up to t = 130 nm.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

UV‐Sensing Semitransparent Organic Field‐Effect Transistors with Wide Bandgap Small Molecular Channel and Polymeric Gate‐Insulating Layers

Lee

Kim

et al. 2017

Adv Elect Materials

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This study demonstrates UV‐sensing semitransparent organic field‐effect transistors (OFETs) with wide bandgap small molecular channel and polymeric gate‐insulating layers. N,N′‐di(1‐naphthyl)‐N,N′‐diphenyl‐(1,1′‐biphenyl)‐4,4′‐diamine (NPB) is employed as the wide bandgap channel layer, while poly(methyl methacrylate) is introduced as the wide bandgap gate‐insulating layer. The performance of OFETs is optimized by NPB thickness control and thermal treatment. Results show that the best device performance (on/off ratio = 4.7 × 106 and hole mobility = 4.2 × 10−5 cm2 V−1 s−1) is achieved by thermal treatment of the 130 nm thick NPB layers at 70 °C for 30 min leading to a noticeably changed surface morphology in the NPB layers. The optimized OFETs exhibit excellent operation stability without hysteresis, while those with semitransparent silver electrodes deliver quite a good transparency. The semitransparent OFETs can sensitively detect a UV light with high stability even though no photoresponse is measured under a visible light.

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Section: Wwwadvelectronicmatdementioning

confidence: 99%

UV‐Sensing Semitransparent Organic Field‐Effect Transistors with Wide Bandgap Small Molecular Channel and Polymeric Gate‐Insulating Layers

Lee

Kim

et al. 2017

Adv Elect Materials

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“…The emission layer of ELDs can be easily relaxed by Joule heating during operation and can eventually lead to device destruction 2. To fabricate ELDs with high stability, much research has been performed to improve the stability of organic materials and the interface between the metal electrode and the organic thin film 3…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and electroluminescent properties of a novel perylene‐containing copolyimide

Yang

Wang

et al. 2003

J of Applied Polymer Sci

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A novel diphenylfluorene-based Cardo copolyimide containing perylene (PFB5) was designed and synthesized by polycondensation of a diamine 4,4Ј-(9H-fluoren-9-ylidene)bisphenylamine with perylene dianhydride and another dianhydride in m-cresol with isoquinoline as a catalyst at 200°C. PFB5 was characterized by FTIR, EA, GPC, TGA, DSC, UV-vis, and PL. Because of the existence of the bulky diphenylfluorene units in the backbone, PFB5 showed high thermal stability and good solubility in common solvents such as chloroform. Solubility of PFB5 in low boiling point solvents allows direct spin coating of the polymer films, which exhibit intense photo-and electroluminescence (EL) in the visible range. This nonconjugated polymer could be used as emitting and electron-hole transporting layers in polymer electroluminescent devices (PELDs). EL properties of the unilayer ELDs based on PFB5 are discussed. The device emitted a greenish yellow light.

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“…This result implies a very promising future for the TIMS nanolayer as the HITL in OLEDs, and proposes further control of the TIMS nanolayer thickness in order to reduce the turn-on voltage for enhancing the maximum luminance, seen from the TPD device with the reduced TPD thickness (see "f" in Figure 5): Here no significant device degradation is expected for the TIMS device by reducing the TIMS thickness due to the stabilizing of TPD molecules by durable MS walls, whereas the catastrophic deterioration is observed frequently for the thinner TPD devices. 30 Finally, we noticed that the Commission Internationale de l'Eclairage (CIE) chromaticity coordinate (x, y) was almost not changed for the HOLED with the 70 nm thick TIMS nanolayer, whereas it was changed from (0.31, 0.56) to (0.32, 0.55) upon increasing the applied voltage up to 32 V for the TPD device. www.acsnano.org…”

Section: Resultsmentioning

confidence: 94%

Mesoporous Silica Nanolayers Infiltrated with Hole-Transporting Molecules for Hybrid Organic Light-Emitting Devices

Park

Kim

et al. 2008

ACS Nano

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Organic hole-transporting molecules were infiltrated into inorganic mesochannels via hexagonally ordered nanopores that are open at the edge side of mesoporous silica (MS) nanolayers prepared using a block copolymer template. This organic-molecule-infiltrated MS nanolayer was used as a hole injection/transport layer for hybrid organic light-emitting devices (HOLED) for improving the device stability. The result showed that the efficiency of HOLED is within reach of that of conventional devices, promising further improvement by the thickness control.

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Hole-transporting polyimide for organic electroluminescent display

Cited by 21 publications

References 26 publications

UV‐Sensing Semitransparent Organic Field‐Effect Transistors with Wide Bandgap Small Molecular Channel and Polymeric Gate‐Insulating Layers

UV‐Sensing Semitransparent Organic Field‐Effect Transistors with Wide Bandgap Small Molecular Channel and Polymeric Gate‐Insulating Layers

Synthesis, characterization, and electroluminescent properties of a novel perylene‐containing copolyimide

Mesoporous Silica Nanolayers Infiltrated with Hole-Transporting Molecules for Hybrid Organic Light-Emitting Devices

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