Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

Abstract

Polymer organic light-emitting diodes (PLED) are one of the most studied subjects in flexible electronics thanks to their economical wet fabrication procedure for enhanced price advantage of the product device. In order to optimize PLED efficiency, correlating the polymer structure with the device performance is essential. An important question for the researchers in this field is whether the polymer backbone is conjugated or not as it affects the device performance. In this review, recent advances in non-conjugated polymers employed as the emitting layer in PLED devices are first discussed, followed by their contrast with the conjugated counterparts in terms of polymer synthesis, sample quality, physical properties and device performances. Such comparison between conjugated and non-conjugated polymers for PLED applications is rarely attempted, and; hence, this review shall provide a useful insight of emitting polymers employed in PLEDs.

Fluorene-Based Donor-Acceptor Copolymers Containing Functionalized Benzotriazole Units: Tunable Emission and their Electrical Properties

“…The semiconductive nature of conjugated polymers makes them attractive candidates as alternatives to inorganic materials in electronics and photonics, principally due to their promise for low cost and large-scale processing of devices such as light-emitting diodes [1], solar cells [2][3][4][5][6], and organic field-effect transistors (OFETs) [7][8][9][10][11][12]. In addition, synthetic chemistry is a powerful tool to create new routes for the design and synthesis of new conjugated materials and device architectures, allowing modification of chemical structures and the development of new polymeric formulations, thus allowing the control of their optical and electronic properties.…”

“…One of the best, easiest, and most effective approaches to extend the absorption range is to design random D-A copolymers consisting of three or more monomers with complementary absorptions or the blending of two or more different polymers containing monoacceptor and mono-donor with complementary absorption [18][19][20][21]. For example, full color displays can be formulated using classical structures like homopoly (9,9-di-n-octylfluoren-2,7-diyl) (PFO, λemax = 417 nm), poly[ (9,9-di-n-octylfluoren-2,7-diyl)-alt-(benzo [2,1,3]thiadiazol-4,8-diyl)] (F8BT, λemax = 515 nm), and poly[2-methoxy-5-(2-ethylhexyloxy)-alt-1,4-phenylenevinylene] (MEH-PPV, λemax = 554 nm) due to the variety of band gaps that can be realized through chemical modification.…”

Synthesis of Water‐Soluble Blue‐Emissive Tricyclic 2‐Aminopyridinium Salts by Three‐Component Coupling‐(3+3)‐Anellation

“…Organic luminophores are particularly important synthetic targets because of the numerous important applications,such as in organic light-emitting devices, [1] food safety, [2] analytics, [3] and medicine. [4] Fluorescent imaging agents possess extremely high sensitivity,s patial-temporal resolution and tunability,a nd thus are widely employed, for example,w ith STED (stimulated emission depletion) microscopy to monitor various biological processes with high accuracy.…”

Dreikomponenten‐Kupplungs‐(3+3)‐Anellierung zum Aufbau von blaufluoreszierenden, wasserlöslichen, tricyclischen 2‐Aminopyridinsalzen

“…DurchIntegration in eine konsekutive Dreikomponentenreaktion kçnnen die Titelmoleküle besonders rasch und effizient im Sinne einer Diversitätsorientierten Reaktionsführung aufgebaut werden. Besonders interessant ist dabei, dass die so dargestellten bi-und tricycli-schen2-Aminopyridinsalze sowohlinDichlormethan als auch in Wasser stark fluoreszents ind, was diese Luminophore zu geeigneten Kandidaten in der Bioanalytik macht.Z usätzlich zeigen ausgewählte Derivate neben der Fluoreszenz in Lçsung auchFestkçrperfluoreszenz, sodass sie als Blaulichtemitter mit einstellbaren Effizienzen Anwendung finden kçnnen.Organische Luminophore sind aufgrund zahlreicher wichtiger Anwendungen, wie bspw.a ls Organische-Leuchtdioden, [1] in der Lebensmittelsicherheit, [2] sowie in der Analytik [3] und der Medizin, [4] von besonderer Bedeutung. Fluoreszierende Bildgebungsmittel besitzen neben einer enorm hohen Empfindlichkeit eine leichte Abstimmbarkeit und ermçglichen daher eine gute temporäre Ortsauflçsung.S ie finden daher z.…”

“…Organische Luminophore sind aufgrund zahlreicher wichtiger Anwendungen, wie bspw.a ls Organische-Leuchtdioden, [1] in der Lebensmittelsicherheit, [2] sowie in der Analytik [3] und der Medizin, [4] von besonderer Bedeutung. Fluoreszierende Bildgebungsmittel besitzen neben einer enorm hohen Empfindlichkeit eine leichte Abstimmbarkeit und ermçglichen daher eine gute temporäre Ortsauflçsung.S ie finden daher z.…”