Multilayer polymer light-emitting diodes by blade coating method

Abstract

Multilayer polymer light-emitting diodes fabricated by blade coating are presented. Multilayer of polymers can be easily deposited by blade coating on a hot plate. The multilayer structure is confirmed by the total thickness and the cross section view in the scanning electron microscope. The film thickness variation is only 3.3% in 10cm scale and the film roughness is about 0.3nm in the micron scale. The efficiency of single layer poly(para-phenylene vinylene) copolymer Super Yellow and poly(9,9-dioctylfluorene) (PFO, deep blue) devices are 9 and 1.7cd∕A, respectively, by blade coating. The efficiency of the PFO device is raised to 2.9cd∕A with a 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) hole-blocking layer and to 2.3cd∕A with a poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl))diphenylamine)] elec-tron-blocking layer added by blade coating.

Roll‐to‐Roll fabrication of large area functional organic materials

“…Various studies with R2R-compatible methods have been made and show the applicability of slot-die coating, 67 screen printing, 73,105,106 blade coating, 68,72,107 gravure printing, 69,71,108,109 and inkjet printing, 70,110,111 which has its advantages for pixel-based display applications. The following reports are highlighted for their closest potential in R2R up scaling.…”

Vapor deposition of copper(I) bromide films via a two-step conversion process

“…4 The spiro-OMeTAD HTM is usually deposited by spin coating, which typically incorporates only ca. 5% of the expensive starting material 5 and produces nonconformal films. 6 To compensate for this lack of conformality, a HTM of spiro-OMeTAD must be at least 150 nm thick to prevent shunting between the absorber and the back contact of the cell.…”

Indium Tin Oxide-Free Large-Area Flexible Organic Light-Emitting Diodes Utilizing Highly Conductive poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) Anode Fabricated by the Knife Coating Method

“…최근에는 PEDOT:PSS 박막을 황산으로 후 처리하여, 가장 높은 전기전도도 4380 S/cm를 달성하였으며, 이는 ITO와 비교할만한 전도도이다 [11] . [12][13][14][15] . 나이프 코팅 방법의 원리는 …”