White organic light-emitting diode comprising of blue fluorescence and red phosphorescence

Qin, Dashan; Ye Tao
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113507
Academic Journal
A white organic light-emitting diode with the structure of ITO/NPB 30 nm/TCTA+2% TPP 20 nm/BCP+0.4% Ir(piq)320 nm/Alq3 40 nm/Mg:Ag was fabricated and characterized, where 2,5,7,10-tetra-phenylpyrene and tris(1-phenylisoquinoline) iridium (III) [Ir(piq)3] were used as a blue fluorescent dye and a red phosphorescent dye respectively. The I–V characteristics of the device showed a turn-on voltage of 2.6 V. The electroluminescent spectra of the device consisted of blue fluorescent and red phosphorescent emissions. The intensity of the blue emission increased gradually relative to the red emission with increasing voltage. The emissions of the device were in the white-light region between 10 and 15 V. A maximum white light luminance of 1076 cd/m2 with CIE coordinates of (x, y=0.27, 0.24) was reached at 15 V with an efficiency of 1.35 cd/A. The white light emission is related to the simultaneous exciton formation on both sides of the TCTA/BCP interface.


Related Articles

  • Thermally stable luminescence of KSrPO4:Eu2+ phosphor for white light UV light-emitting diodes. Tang, Yu-Sheng; Hu, Shu-Fen; Lin, Chun Che; Bagkar, Nitin C.; Liu, Ru-Shi // Applied Physics Letters;4/9/2007, Vol. 90 Issue 15, p151108 

    A novel blue phosphor based on phosphate host matrix, KSrPO4 doped with Eu2+, was prepared by solid state reaction. The phosphor invariably emits blue luminescence with a peak wavelength at 424 nm under ultraviolet excitation at 360 nm. Eu2+-doped KSrPO4 phosphors show higher thermally stable...

  • High peak luminance of molecularly dye-doped organic light-emitting diodes under intense voltage pulses. Wei, B.; Ichikawa, M.; Furukawa, K.; Koyama, T.; Taniguchi, Y. // Journal of Applied Physics;8/15/2005, Vol. 98 Issue 4, p044506 

    The performance and efficiency of molecularly doped organic light-emitting devices (OLEDs) using voltage pulses have been investigated. The maximum current density and peak luminance have been found to depend on the pulse duration and device size, which was attributed to the heat effect in...

  • Intense green-emitting Sr2LiSiO4F:Eu2+ phosphor for n-UV white LEDs. Xinmin Zhang; Jong Su Kim // Applied Physics A: Materials Science & Processing;Nov2009, Vol. 97 Issue 3, p549 

    Eu2+-activated Sr2LiSiO4F phosphors were synthesized at 900°C by solid-state reaction in reducing atmosphere, and their photoluminescence (PL) properties were systematically investigated by diffuse reflection spectra, PL excitation and emission spectra, and by the fluorescence decay curve....

  • Optical properties of blue light-emitting diodes in the InGaN/GaN system at high current densities. Bochkareva, N. I.; Gorbunov, R. I.; Klochkov, A. V.; Lelikov, Yu. S.; Martynov, I. A.; Rebane, Yu. T.; Belov, A. S.; Shreter, Yu. G. // Semiconductors;Nov2008, Vol. 42 Issue 11, p1355 

    The current-voltage and brightness-voltage characteristics and the electroluminescence spectra of blue InGaN/GaN-based light-emitting diodes are studied to clarify the cause of the decrease in the emission efficiency at high current densities and high temperatures. It is found that the linear...

  • Recombination distribution and color tuning of multilayer organic light-emitting diode. Chia-Hsun Chen; Hsin-Fei Meng // Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p201102 

    The recombination distribution of an organic light-emitting diode with multiple emissive layers is studied theoretically. Due to the relatively low electron mobility, the recombination concentrates in the layer next to the cathode. As the voltage increases, the recombination extends to the...

  • Negative capacitance in organic light-emitting diodes. Pingree, L. S. C.; Scott, B. J.; Russell, M. T.; Marks, T. J.; Hersam, M. C. // Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p073509 

    Negative capacitance has been characterized in organic light-emitting diode (OLED) heterostructures using impedance spectroscopy. Although similar inductive behavior has been previously reported for transient electroluminescence in OLEDs, definitive identification of negative capacitance in...

  • Comparison of blue and green InGaN/GaN multiple-quantum-well light-emitting diodes grown by metalorganic vapor phase epitaxy. Qi, Y. D.; Liang, H.; Wang, D.; Lu, Z. D.; Tang, W.; Lau, K. M. // Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101903 

    InGaN/GaN multiple-quantum-well (MQW) blue and green-light-emitting diodes (LEDs) were grown on sapphire substrates using metalorganic vapor phase epitaxy. High-resolution transmission microscopy shows that a much larger density of stacking faults exist in the quantum-well region of the blue...

  • Optical properties of a novel yellow fluorescent dopant for use in organic LEDs. Choy, W. C. H.; Wu, Y. S.; Chen, C. H.; Cheah, K. W. // Applied Physics A: Materials Science & Processing;Aug2005, Vol. 81 Issue 3, p517 

    In this paper, the optical properties of a novel organic, 2,8-di(t-butyl)-5,11-di[4(t-butyl) phenyl]-6,12-diphenylnaphthacene (tetra(t-butyl)rubrene) have been investigated. Our results show that there are two peaks in the photoluminescence (PL) spectra of tetra(t-butyl)rubrene (TBRb) which are...

  • Photochemistry of Organic Light-Emitting Diodes. Ehara, Masahiro; Nakatsuji, Hiroshi // AIP Conference Proceedings;12/26/2007, Vol. 963 Issue 2, p306 

    The optical properties and excited-state geometries of some organic light-emitting diodes have been investigated by the SAC-CI method. The absorption and emission spectra have been predicted in high accuracy and the chain-length dependence of transition energies has been precisely reproduced....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics