Fabrication of 5.8‐in. OTFT‐driven flexible color AMOLED display using dual protection scheme for organic semiconductor patterning

Abstract

Abstract— A 5.8‐in. wide‐QQVGA flexible color active‐matrix organic light‐emitting‐diode (AMOLED) display consisting of organic thin‐film transistors (OTFTs) and phosphorescent OLEDs was fabricated on a plastic film. To reduce the operating voltage of the OTFTs, Ta2O5 with a high dielectric constant was employed as a gate insulator. Pentacene was used for the semiconductor layer of the OTFTs. This layer was patterned by photolithography and dry‐etched using a dual protection layer of poly p‐xylylene and SiO2 film. Uniform transistor performance was achieved in the OTFT backplane with QQVGA pixels. The RGB emission layers of the pixels were formed by vacuum deposition of phosphorescent small molecules. The resulting display could clearly show color moving images even when it was bent and operated at a low driving voltage (below 15 V).

High-mobility solution-processed copper phthalocyanine-based organic field-effect transistors

“…This has been driven by scientific interest [1,2] and the potential applications of OFETs in new technologies such as flexible displays [3,4], logic circuits [5][6][7], radio frequency identification (RFID) tags [8,9], electronic paper [10,11] and sensing [12][13][14]. Organic compound-based devices offer interesting advantages over their inorganic counterparts in terms of their cost-effective deposition using low-energy vapour and solution phase methods that are suitable for large-area coverage on both solid and flexible substrates [15][16][17].…”

Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices

“…Organic light-emitting devices (OLEDs) are of potential interest in applications such as flat televisions, mobile displays 1,2 , lights 3 , and optical communication light sources. 4 OLEDs are usually composed of functionally divided organic multilayersfor example, hole-transporting (HT), emissive, and electron-transporting (ET) layers.…”

“…For example, in the case of the conventional aluminum trisquinolinol (Alq)-based fluorescent OLED with BTBB, current densities of 3.5 mA/cm 2 and 100 mA/cm 2 were reached at voltages of 3.0 V and…”

Bipyridyl-substituted benzo[1,2,3]triazoles as a thermally stable electron transporting material for organic light-emitting devices

“…Organic light-emitting devices (OLEDs) are of interest for potential applications in various fields such as flat-screen televisions, mobile displays, 1,2 lights, 3 and optical communication light sources. 4 OLEDs are usually constructed with functionally divided organic multilayers-for example, hole-transporting (HT), emissive, and electron-transporting (ET) layers.…”

“…[39][40][41] In this paper we demonstrate bis(bipyridyl)-substituted 2H-benzo [1,2,3]triazole derivatives (BpyBTAZ compounds) as ETMs with high thermal stability. The resulting AA-Ar was brominated directly in chloroform, and then Br-BTAZ-Ar was obtained by an oxidative cyclization with diacetoxyiodobenzene (PhI(OAc) 2 ) in toluene, as reported in literature.…”