High efficiency green phosphorescent organic light emitting devices using the emission layer of (TCTA/TCTA_1/3 TAZ_2/3/TAZ): Ir(ppy)₃

We have fabricated and evaluated newNew high high-efficiency green green-light light-emitting phosphorescent devices with an emission layer of [TCTA/TCTA_1/3TAZ_2/3/TAZ] : Ir(ppy)₃ were fabricated and evaluated, and compared the electroluminescence characteristics of these devices were compared with the conventional phosphorescent devices with emission layers of (TCTA_1/3 TAZ_2/3): Ir(PPY)3 and (TCTA/TAZ): Ir(ppy)₃. The current density, luminance, and current efficiency of the a device with an emission layer of (80Å-TCTA/90°A- TCTA_1/3 TAZ_2/3/130Å-TAZ): 10%-Ir(ppy)₃ were 95 mA/cm², 25000 cd/m², and 27 cd/A at an applied voltage of 10 V, respectively. The maximum current efficiency was 52 cd/A under the a luminance value of 400 cd/m². The peak wavelength and FWHM (FWHM (full width at half maximum) in the electrolumineseence spectral were 513 nm and 65 nm, respectively. The color coordinate was (0.30, 0.62) on the CIE (Commission Internationale de I'Eclairage) chart. Under the a luminance of 15000 cd/m², the current efficiency of the a device with an emission layer of (80Å-TCTA/90Å- TCTA_1/3TAZ_2/3/ 130Å-TAZ): 10%-Ir(ppy)₃ was 34 cd/A, which has beenshowed an improvement of improved 1.7 and 1.4 times compared to those of the devices with emission layers of (300Å- TCTA_1/3TAZ_2/3):10%-Ir(ppy)₃ and (100Å-TCTA/200Å-TAZ): 10%-Ir(ppy)₃, respectively.