Simple and high efficiency green phosphorescent devices using an intermixed double host of 4, 4', 4"-tris(N-carbazolyl) triphenylamine [TCTA], 1, 3, 5-tris (N-phenylbenzimiazole-2-yl) benzene [TPBI], phosphorescent dye of tris(2-phenylpyridine)iridium(III) [$Ir(ppy)_3$], and selective dop...
Simple and high efficiency green phosphorescent devices using an intermixed double host of 4, 4', 4"-tris(N-carbazolyl) triphenylamine [TCTA], 1, 3, 5-tris (N-phenylbenzimiazole-2-yl) benzene [TPBI], phosphorescent dye of tris(2-phenylpyridine)iridium(III) [$Ir(ppy)_3$], and selective doping in the TPBI region were fabricated, and their electro luminescent characteristics were evaluated. In the device fabrication, layers of $70{\AA}$-TCTA/$90{\AA}$-$TCTA_[0.5}TPBI_{0.5}$/$90{\AA}$-TPBI doped with $Ir(ppy)_3$ of 8% and an undoped layer of $50{\AA}$-TPBI were successively deposited to form an emission region, and SFC137 [proprietary electron transporting material] with three different thicknesses of $300{\AA}$, $500{\AA}$, and $700{\AA}$ were used as an electron transport layer. The device with $500{\AA}$-SFC137 showed the luminance of $48,300\;cd/m^2$ at an applied voltage of 10 V, and a maximum current efficiency of 57 cd/A under a luminance of $230\;cd/m^2$. The peak wavelength in the electroluminescent spectral and color coordinates on the Commission Internationale de I'Eclairage [CIE] chart were 512 nm and (0.31, 0.62), respectively.
Simple and high efficiency green phosphorescent devices using an intermixed double host of 4, 4', 4"-tris(N-carbazolyl) triphenylamine [TCTA], 1, 3, 5-tris (N-phenylbenzimiazole-2-yl) benzene [TPBI], phosphorescent dye of tris(2-phenylpyridine)iridium(III) [$Ir(ppy)_3$], and selective doping in the TPBI region were fabricated, and their electro luminescent characteristics were evaluated. In the device fabrication, layers of $70{\AA}$-TCTA/$90{\AA}$-$TCTA_[0.5}TPBI_{0.5}$/$90{\AA}$-TPBI doped with $Ir(ppy)_3$ of 8% and an undoped layer of $50{\AA}$-TPBI were successively deposited to form an emission region, and SFC137 [proprietary electron transporting material] with three different thicknesses of $300{\AA}$, $500{\AA}$, and $700{\AA}$ were used as an electron transport layer. The device with $500{\AA}$-SFC137 showed the luminance of $48,300\;cd/m^2$ at an applied voltage of 10 V, and a maximum current efficiency of 57 cd/A under a luminance of $230\;cd/m^2$. The peak wavelength in the electroluminescent spectral and color coordinates on the Commission Internationale de I'Eclairage [CIE] chart were 512 nm and (0.31, 0.62), respectively.
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제안 방법
The devices deposited with SFC137 of 300 Å, 500 Å and 700 Å showed current densities of 260 mA/cm2, 150 mA/cm2, 110 mA/cm2 and luminances of 61,500 cd/m2, 48,300 cd/m2, 33,700 cd/m2 at an applied voltage of 10 V, respectively.
이론/모형
The organic thin layers and metallic layers were deposited under 5×10-8 Torr using in-situ method.
성능/효과
In the experiments, the best luminance characteristics was obtained in the device with SFC137 of 500 Å, which had the luminance of 48,300 cd/m2 at an applied voltage of 10 V and the maximum current efficiency of 57 cd/A under a luminance of 230 cd/m2.
In this study, electroluminescent characteristics of a newly proposed device without an extra hole/exciton blocking layer were firstly compared with those of a conventional device with Balq as a HBL. Thereafter, the effect of ETL thickness variation on the electroluminescent characteristics in the newly proposed device was investigated.
Simpler structure without any deterioration of performance makes the newly proposed device very attractive in the device application. It is thought that good performance of this device even without any additional HBL could be obtained by the adoption of intermixed double host structure from TCTA and TPBI and selective doping in the TPBI region. The newly proposed device does not need any additional HBL because the undoped layer of TPBI has a function of effective hole/exciton blocking layer itself.
참고문헌 (12)
S. Lamansky, P. Djarovich, D. Murphy, F.A. Razzaq, R. Kwong, I. Tsyba, M. Bortz, B. Mui, R. Bau and M.E. Thompson, J. Am. Chem. Soc., 123, 4304 (2001)
X. Zhou, D.S. Qin, M. Pfeiffer, J. Blochwitz, A. Werner, J. Crechsel, B. Maennig, K. Leo, M. Bold, P. Erk and H. Hartmann, Appl. Phys. Lett., 81, 4070 (2002)
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