Single-layer blue electrophosphorescent organic light-emitting diodes based on small-molecule mixed hosts: Comparison between the solution and vacuum fabrication processes
Journal
Japanese Journal of Applied Physics
Journal Volume
52
Journal Issue
1
Date Issued
2013
Abstract
Single-layer and efficient blue phosphorescence organic light-emitting diodes (PHOLEDs) utilizing a small molecule host, bis[3,5-di(9 H -carbazol-9-yl)phenyl]diphenylsilane (SimCP2), as the host material were investigated. All active components including SimCP2, 1,3-bis[(4- tert -butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7), and iridium(III) bis[(4,6-di-fluorophenyl)-pyridinato- N , C 2 ] picolinate (FIrpic) were mixed in an organic solution for wet processing in the fabrication of single-layer PHOLEDs. The device's performance significantly exceeds other small-molecule-host, single-layer, blue PHOLEDs fabricated by the solution process. With minimum efficiency roll-off, a maximum current efficiency of 13.6 cd/A, power efficiency of 8 lm/W, external quantum efficiency of 4.71%, and Commission Internationale de L'Eclairage (CIE x , y ) coordinates of (0.15,0.36) at 600 cd/m 2 have been achieved. In addition, the device performance of the solution-processed single-layer PHOLED is much greater than that of its vacuum-deposited counterparts.
SDGs
Type
journal article