Faraco, Thales A.
Silva, Halice de O. X.
Barud, Hernane da S.
Maciel, Indhira O.
da Silva, Robson R.
Quirino, Welber G.
Ribeiro, Clovis A.
Dias, Diogenes dos S.
Pandoli, Omar G.
Total Authors: 12
 Univ Fed Juiz de Fora, Dept Fis, Grp Nanociencia & Nanotecnol NANO, BR-36036330 Juiz de Fora, MG - Brazil
 Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
 Univ Estatual Paulista Julio de Mesquita Filho UN, Inst Quim, BR-14801970 Araraquara, SP - Brazil
 BioSmart Nanotechnol, BR-14808162 Araraquara, SP - Brazil
 Pontificia Univ Catol Rio de Janeiro PUC Rio, Dept Quim, BR-22453970 Rio De Janeiro, RJ - Brazil
 Pontificia Univ Catolica Rio de Janeiro, Dept Fis, Lab Optoelet Mol LOEM, BR-22453970 Rio De Janeiro, RJ - Brazil
Total Affiliations: 7
ACS APPLIED MATERIALS & INTERFACES;
NOV 13 2019.
Web of Science Citations:
A new biopolymer obtained from onion pulp (Allium cepa L.) was employed to produce a sustainable substrate for flexible organic light-emitting diodes (FOLEDs). Indium tin oxide (ITO) and SiO2 thin films were deposited by rf-magnetron sputtering onto these biosubstrates to obtain flexible, transparent, and conductive anodes, on top of which FOLEDs were produced. This new biomaterial exhibits an optical transparency of 63% at 550 nm. ITO films were optimized by varying rf power during deposition onto the biopolymers, and their electrical properties are comparable to the those of ITO grown on top of rigid substrates: a carrier concentration of -3.63 x 10(21) cm(-3) and carrier mobility of 7.72 cm(2) V-1 s(-1) for the optimized film. Consequently, the sheet resistance and resistivity of this ITO film were 8.92 Omega sq(-1) and 2.23 x 10(-4) Omega cm, respectively, hence allowing the production of FOLEDs. The A. cepa L. based FOLED was fabricated using CuPc, beta-NPB, and Alq(3) as organic layers, and it exhibited a maximum luminance of about 2062 cd m(-2) at 16.6 V. The current efficiency reached a maximum value of 2.1 cd A(-1) at 85.3 mA cm(-2). The obtained results suggest the possibility to use these substrates for innovative biocompatible applications in optoelectronics, such as photodynamic therapy. (AU)