High-efficiency white organic light-emitting devices using a blue iridium complex to sensitize a red fluorescent dye

Abstract

We report the fabrication of high-efficiency white organic light-emitting devices (WOLEDs) by using a blue phosphorescent dye iridium (III) tris(5-(2,4-difluoro-phenyl)-10,10-dimethyl- 4-aza-tricycloundeca-2,4,6-triene) (Ir(F2-mppy)3) to sensitize the red dye[2-methyl-6- [2-(2,3,6,7-tetrahydro-1H c5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene]propane-din- itrile (DCM2). Ir(F2-mppy)3 and DCM2 were codoped into the 4,4′-N,N′-dicarbazole-biphenyl (CBP) host. The WOLEDs with 8wt% Ir(F2-mppy)3 and 0.5wt% DCM2 showed white emission with a color rendering index of 70. The maximum luminance and maximum current efficiency of the device are, respectively, 16220cd∕m2 and 9.28cd∕A.

Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

“…These complexes are highly versatile since neutral [7][8][9][10][11][12], cationic [13][14][15][16][17], anionic [18,19] but also soft salts [20,21], in which both the ion-paired anionic and cationic iridium complexes can participate to light emission, were successfully used as triplet emitters for OLEDs. These complexes also benefit from several appealing features including high quantum yield of luminescence [22,23], phosphorescence at room temperature [24] and relatively short excited state lifetimes so that key adverse factors such as triplet-triplet annihilation and back energy transfer from the guest to the host are strongly limited [25][26][27][28]. Emission color can also be easily tune by mean of the ligands introduced in the coordination sphere of the metal cation, enabling the emission to range from blue to red [29][30][31][32][33][34][35].…”

Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region

“…Organic light-emitting diodes (OLEDs) have attracted considerable attention because of their many excellent merits in flat panel display and solid-state lighting since Tang and Vanslyke [1] first reported on an organic electroluminescent device with multilayer structure in 1987. [2][3][4][5] No matter whether they are applied to display or illumination, the obtainment of white light is particularly important. As is well known, a blue light-emitting device with excellent electroluminescence (EL) performance is a crucial factor for the development of the white light.…”

The Influence on the Organic Electroluminescent Device Performance with Different DPAVBi Position

“…Therefore, most researchers working in the field of OLED are foucs on improving the efficiency of OLED. One of the ways to improve the electroluminescent (EL) efficiency is the use of a fluorescent-dye dopant [7][8][9] . Experiments prove that the device efficiency with doping phosphorescence dye is obviously improved [10] .But because the alternative of phosphorescent materials is limited.And most of the phosphorescent materials are heavy metals omplexes like Ir, Pt, Os, Ru etc.…”