A new high efficiency green light emitting phosphorescent device with an emission layer consisting of {4,4',4 ''-tris(N-carbazolyl)-triphenylamine[TCTA]/TCTA(0.5)TPBi(0.5)/1,3,5-tris(N-phenylbenzimiazole-2-yl)benzene [TPBi]}:tris(2-phenylpyridine)iridium(III)[Ir(ppy)(3)] was fabricated and its electroluminescence characteristics were evaluated in comparison with those of devices with emission layers made of (TCTA(0.5)TPBi(0.5)):Ir(ppy)(3) and (TCTA/TPBi):Ir(ppy)(3). The device with the emission layer consisting of (TCTA/TCTA(0.5)TPBi(0.5)/TPBi):Ir(ppy)(3) showed a luminance of 11,000 cd/m(2) at an applied voltage of 8 V and maximum current efficiency of 63 cd/A under a luminance of 500 cd/m(2). The peak wavelength in the electroluminescent spectral and color coordinate on the Commission Internationale de I'Eclairage(CIE) chart were 513 nm and (0.31, 0.62) in this device, respectively. Under a luminance of 10000 cd/m(2), the current efficiency of this device was 55 cd/A, which is 1.4 and 1.1 times better than those of the devices with the emission layers made of (TCTA(0.5)TPBi(0.5)):Ir(ppy)(3) and (TCTA/TPBi):Ir(ppy)(3), respectively. (C) 2009 Elsevier B.V. All rights reserved.