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URN etd-0621113-143643
Author Huei- Jhen Siao
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Investigation of phosphorescent OLEDs utilizing bipolar host materials
Date of Defense 2013-07-15
Page Count 85
Keyword
  • purification
  • phOLED
  • vacuum evaporation deposition
  • bipolar host materials
  • white OLED
  • Abstract Recently, bipolar hosts have aroused considerable interests in the phosphorescent organic light-emitting diodes (ph-OLEDs). The ph-OLEDs utilizing bipolar hosts usually exhibit better device performance benefiting by the balance of electron and hole fluxes. The simplified structure also reduces production cost efficiently.
    In this thesis, we reported a series of pyrrole derivatives for bipolar host materials, which exhibit bipolar carrier transport properties as host materials for ph-OLEDs.
    Both green and red-emitting ph-OLEDs were demonstrated in the thesis. In the study of green-emitting ph-OLEDs, the device configuration with the best performance was ITO/α-NPB (35nm)/ppn:16% ir(ppy)3( 30nm)/Bphen (44nm)/ LiF(0.5nm)/Al(130nm).
    The maximum brightness, current efficiency, and power efficiency of the device was 13419cd/m2, 3.16 cd/A, and 1.34 lm/W, respectively.
    In the study of red-emitting phOLEDs, the device configuration with the best performance was ITO/TAPC(35nm)/ppn:2%ir(pq)2acac(30nm)/Bphen(44nm)/LiF(0.5nm)/Al(130nm).The maximum brightness, current efficiency, and power efficiency of the device was 42648 cd/m2,12.4 cd/A, and 10.2 lm/W, respectively.
    Such high power efficiency in the simplified device structure shows great potential of the bipolar host, ppn, in the application of deep-red ph-OLEDs.
    Finally, white OLEDs with the configuration of ITO/TAPC (35nm)/ mcp:7% firpic (10nm)/ppn:2% ir(pq)2acac(10nm)/ mcp:7% firpic(10nm)/Bphen(44nm) /LiF(0.5nm)
    /Al(130nm) was demonstrated. The current efficiency and CIE 1931 color coordinates of the device was 7.80 cd/A and (0.37,0.37) , respectively .The results indicate that the device is suitable for display or lighting applications.
    Advisory Committee
  • Wen-Jang Kuo - chair
  • Mei-Ying Chang - co-chair
  • Hsiang-Chen Wang - co-chair
  • Li-Yi Chen - advisor
  • Files
  • etd-0621113-143643.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2013-07-22

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