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High color rending index and high-efficiency white organic light-emitting diodes based on the control of red phosphorescent dye-doped hole transport layer

M. Y. Zhang, F. F. Wang, N. Wei, P. C. Zhou, K. J. Peng, J. N. Yu, Z. X. Wang, and B. Wei

Open Access Open Access

Abstract

We have investigated the transport characteristics of red phosphorescent dye bis(1-(phenyl)isoquinoline) iridium (III) acetylanetonate (Ir(piq)2acac) doped 4,4’,4”-tri(N-carbazolyl)triphenylamine (TCTA), and found that the increasing doping ratio was facilitated to improve the ability of hole transporting. A high color rendering index (CRI) and high-efficiency WOLED was achieved by employing Ir(piq)2acac doped TCTA film as an effective red emissive layer due to the generation of charge transfer complex (CTC) at the interface. The relative proportion in red: green: blue emission intensity can be controlled by the CTC concentration to obtain high CRI WOLEDs. The WOLED with an optimal red dye doping concentration of 5 wt% exhibits a high CRI of 89 and a power efficiency of 31.2 lm/W and 27.5 lm/W at the initial luminance and 100 cd/m2, respectively. The devices show little variation of the Commission Internationale de I’Eclairage coordinates in a wide range of luminance.

©2012 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a) The proposed energy diagram, (b) general structure of hole-only devices and (c) the J-V characteristics of hole-only devices.

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Fig. 2
Fig. 2 The proposed energy diagram of Devices A, B and C.

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Fig. 3
Fig. 3 (a) EL spectra of reference Device (x = 0) and Devices A (x = 2), B (x = 5) and C (x = 10) at the current density of 0.08 mA/cm2. (b) The current density-voltage-luminance (J-V-L) characteristics of Devices A, B and C.

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Fig. 4
Fig. 4 (a) The J-V-L characteristics of Device B. (b) The current efficiency-luminance-power efficiency characters of Device B. (c)The electroluminescence (EL) spectra of Device B as the voltage applied from 3.4 V to 7.4 V. The inset shows the blue emitting part of the spectra. (d) The CRI histogram at various voltages.

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Tables (1)

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Table 1 Electroluminescent Properties of the Devices B, D, E and F

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