Abstract:We report thermally stable diimide nanoclusters that could potentially replace the conventional thick electron transport layer (ETL) in organic light-emitting devices (OLEDs). Bis-[1,10]phenanthrolin-5-yl-bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic diimide (Bphen-BCDI) was synthesized from the corresponding dianhydride and amine moieties, and its purified product exhibited a high glass transition temperature (232 °C) and a wide band gap (3.8 eV). The Bphen-BCDI subnanolayers deposited on substrates were fo… Show more
“…[1][2][3][4][5][6] Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature Figure 1. [1][2][3][4][5][6] Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature Figure 1.…”
Section: Introductionmentioning
confidence: 99%
“…Organic electronic devices have been extensively studied because of their potentials for advanced next‐generation devices, which can realize ultrathin, lightweight, bendable, and flexible characteristics, since the successful commercialization of organic light‐emitting devices (OLEDs) . Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature processes which can deliver low‐cost manufacturing as well as high design flexibility leading to large‐area devices …”
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.
“…[1][2][3][4][5][6] Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature Figure 1. [1][2][3][4][5][6] Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature Figure 1.…”
Section: Introductionmentioning
confidence: 99%
“…Organic electronic devices have been extensively studied because of their potentials for advanced next‐generation devices, which can realize ultrathin, lightweight, bendable, and flexible characteristics, since the successful commercialization of organic light‐emitting devices (OLEDs) . Compared to conventional inorganic electronic devices, organic electronic devices have further benefit in terms of low temperature processes which can deliver low‐cost manufacturing as well as high design flexibility leading to large‐area devices …”
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.
“…In 2011, the bathophenanthroline (Bphen)-attached imide derivative, bis- [1,10]phenanthrolin-5-yl-bicyclo[2,2,2]oct-7-ene-2,3, 5,6-tetracarboxylic diimide (Bphen-BCDI), was reported to improve OLED performance ( Figure 12C). 156 The Bphen-BCDI material was designed to achieve an EIL material with high thermal stability by attaching the electron-transporting Bphen unit to a thermally stable imide group. The Bphen-BCDI material exhibited a Tg of 232 C and could be easily deposited via thermal evaporation ( Figure 12D).…”
Section: Host Materials For Eml In Tadf-basedoledsmentioning
confidence: 99%
“…D, Differential scanning calorimetry and thermogravimetric analysis (inset) thermograms of Bphen‐BCDI. E, Current density‐voltage‐luminance characteristics of the OLEDs 156 Source : A and B, Reproduced with permission: Copyright 2010, John Wiley & Sons, Inc. C‐E, Reproduced with permission: Copyright 2011, Royal Society of Chemistry…”
Section: Oled Materials According To Applied Layersmentioning
Organic light-emitting devices (OLEDs) have been extensively studied over the past three decades and are still attracting attention owing to their potential use in flexible and foldable displays. To achieve highly durable OLED displays for flexible devices, constitutive OLED materials need to be stable in various environments, including those with thermally and mechanically severe conditions. To this end, the present review aims to investigate the progress of OLED material research over the past two decades with respect to thermal stability. The literature survey is first conducted using the keyword "OLEDs" and then narrowed down to "high thermal stability materials for OLEDs." The number of search results indicates that creating OLED materials with high thermal stability is a widely studied topic in the field of OLED research and has undergone an average growth rate of approximately 15% per year over the past two decades. In this review, the OLED materials used as core layers (ie, the hole injection and transport layers, emission layers, and electron injection and transport layers) are thoroughly analyzed, and the best representative materials are discussed in detail by summarizing their major thermal and electronic characteristics. Finally, several previous reports on flexible and foldable OLED displays are analyzed to determine the importance of the stability of their constitutive materials.
“…Hence, in this work, we synthesized a new diimide material, bis- [1,10]phenanthrolin-5-yl-pyromellitic diimide (Bphen-PMDI), that has a rigid aromatic (i.e., phenyl) ring in the center unit as well as an electron-deficient (i.e., accepting) phenanthroline unit. 14 To evaluate the Bphen-PMDI material as an electron-injecting layer (EIL), we fabricated OLED devices by replacing the LiF layer with the Bphen-PMDI layer. Device results showed that the electron injection from the cathode into the emission layer was greatly improved by the presence of the 1 nm thick Bphen-PMDI layer.…”
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