Electroluminescent properties of MEH–PPV light-emitting diodes fabricated on the flexible substrate

Effects of plasma polymerized para-xylene intermediate layers on characteristics of flexible organic light emitting diodes fabricated on polyethylene terephthalate substrates

“…Maximum brightness of FOLED-C in high voltage range was improved as 2200 cd/m 2 compared with 1900 cd/m 2 of FOLED-A and FOLED-B. We think that the maximum brightness at high voltage range was increased because of the planarize effect at surface and relatively low permeablility, as the RMS value of ITO electrode with PPpX film was improved from 2.1 to 1.7 nm, and this work was mentioned elsewhere [4]. The existences of PPpX intermediate layer not only improve the interface properties in FOLEDs, and can also reduce the contact resistance between the organic layer and the ITO substrate by the good adhesion.…”

“…Fig. 2 showed the AFM images of PET substrate (a) without and (b) with PPpX film deposited at plasma power of 30 W and 25 • C. Generally, PET substrate contains the rougher surface morphology than glass substrate [4]. Therefore, surface roughness and RMS of PET obtained in our experiment has high spikes over 15 and 2.8 nm, respectively.…”

“…Flexible OLEDs (FOLEDs) fabricated on flexible substrates provide ability to conform, bend or roll a display into any shape, and also will give possibility of fabricating displays by continuous roll processing. FOLEDs were made on plastic substrates by many research groups [2][3][4][5]. Generally, plastic substrates have good properties such as high transmittance and flexibility, however, it suffered from low glass transition temperature (T g ) below 200 • C and decreased the lifetime of FOLEDs because of crystallization of organic materials at around 200 • C by diffused moisture and/or oxygen through the plastic substrate [6,7].…”

Transparent Conductive Oxide (TCO) Films for Organic Light Emissive Devices (OLEDs)

“…In this study, the bent FOLEDs have shown inferior device performance because rough surface of the bent ITO was decreased contact property in the interface between the TPD organic layer and ITO electrode. (Kwon et al, 2002) In conclusions, we fabricated FOLEDs with an ITO anode, a TPD hole transport layer, an Alq 3 emitting layer, and an Al cathode deposited on the PET substrate and studied FOLEDs characteristics after bending test at various radiuses of 10 mm, 13 mm, 16 mm, and 19 mm. The performance of FOLEDs with lowered radius ( 16 mm) was decreased the device properties, and increased the sheet resistance of bent ITO.…”

Organic Electroluminescent Devices With Electrochemically Deposited Polyaniline as Hole Injection Layer

“…A buffer layer, such as copper phtalocyanine (CuPc) and poly(ethylenedioxy thiophene)-PSS (PDOT-PSS), was usually interposed between the ITO electrode and the organic layer to improve the performance of devices [1,2].…”