We develop the white organic light-emitting diodes (WOLEDs) with a new
orange electrophosphorescent emission, and the blue electrofluorescent or electrophosphorescent sensitizer. The new orange phosphorescent sensitizer is the thieno-pyridine framework organo-iridium complexes (PO-01). The blue phosphorsensitized
electrofluorescent is 4,4'-Bis(9-ethyl-3-carbazovinylene)-1,1'- biphenyl (DSA) doped into 4,4'-Bis(2,2-diphenyl-ethen-1-yl) diphenyl (DPVBi). Beside, the blue phosphorescent sensitizer is Bis(3,5-difluoro-2-(2-pyridyl)phenyl- (2-carboxypyridyl)iridium (FirPic). The Device Type I of WOLED based on the PO-01 and the DSA doped into DPVBi has an efficiency of 5.7 lm/W (10.6Cd/A) at 500
Cd/m2, a CIE coordinates of (0.33, 0.31), and a CRI of 71. However, the Device Type II of WOLED has an efficiency of 5.5 lm/W (10.3Cd/A) at 500 Cd/m2 and a CIE coordinates of (0.30, 0.42), while the FirPic replaces the DPVBi doped with DSA. The spectra of the Device Type II and I both response insensitive to drive current. Nevertheless, the Device Type I relatively achieves a balanced whit emission with CIE coordinates of (0.33, 0.33). They are good suitability to use in OLED lighting and full-color LCD backlights.
We develop a three-spectrum white organic light-emitting diodes (WOLED) with blue phosphor-sensitized electrofluorescent, green and new red electrophosphorescent emissions. The green phosphorescent sensitizers are bis[5-(trifluoromethyl)-2-(4-fluorophenyl)pyridine]iridium(III)acetylacetonate (Ir-2h) or Bis(2-phenylpyridine) iridium(III)3-Methyl-2,4-pentanedione (Ir(ppy)2mac), and the new red phosphorescent sensitizer is a phenyl-qoinazoline framework organo-iridium complex. The RGB peaks of WOLED with Ir-2h are at a wavelength of 440nm, 516nm, and 633nm, respectively. However, The RGB peaks of WOLED are at a wavelength of 440nm, 550nm, and 625nm, respectively, when the green phosphorescent sensitizer is replaced by Ir(ppy)2mac. Besides, the peak at a wavelength of 550nm is broader than the former. Therefore, The former WOLED of RGB spectra are the most distinct than the later one. The former WOLED has efficiency of 3.3 lm/W (7.15Cd/A) at 1000 Cd/m2, and CIE coordinates of (0.32, 0.35). It is good suitability to use in OLED displays based on RGB color filters and full-color LCD backlights.