Adjusting dopant concentrations in solution process to optimize the white phosphorescent organic light-emitting diodes

作者：Tsai Yu Sheng^*; Chittawanij Apisit; Hong Lin Ann; Ou Chih Yuan; Juang Fuh Shyang; Wang Ching Chiun; Lai Shih Hsiang

来源：Microelectronic Engineering, 2015, 138: 31-35.

DOI：10.1016/j.mee.2015.01.028

• Organic light-emitting diode
• White OLEDs
• Phosphorescent
• Solution process
• Small molecular materials

In this study, white phosphorescent organic light-emitting diodes (PhOLEDs) have been demonstrated with small molecule by using solution processes. Spin-coating is employed as the way for deposition method. 4,4'-N,N'-dicarbazole-biphenyl (CBP) which is typical small molecule based ink is used for spin-coating method, and three phosphorescent dopants materials, Firidium(III) bis[(4,6-difluoro phenyl)-pyridinato-N,C-2'] picolinate (Flrpic), bis[1-(phenyl) isoquinoline) iridium(III) acetyl acetonate (Ir(piq)(2) (acac))], and iridium(III) tris(2-phenylpy-ridine) (Ir(ppy)(3)) were prepared. For spin-coating processes, various parameters properties were investigated including materials concentrations, solvents effect, and electron transporting materials to get high efficiency and white color of white PhOLED device. As a result, the precisely controlled solution processes could be a promising technology for solution process can be a good alternative of vacuum deposition technology.

• 出版日期2015-4-20