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Organic light-emitting diodes with multiple quantum wells

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OLED Group Meeting Organic light-emitting diodes with multiple quantum wells Reporter: Hsiu-Fen Chen Adviser: Dr. Y.-K. Kuo – PowerPoint PPT presentation

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Title: Organic light-emitting diodes with multiple quantum wells


1
Organic light-emitting diodeswith multiple
quantum wells
??????????OLED Group Meeting
  • Reporter Hsiu-Fen Chen
  • Adviser Dr. Y.-K. Kuo
  • Date 2004/06/08

2
Outline
  • MQWs??????????
  • ?????MQW???OLED??
  • MQW????
  • ??????????---Nanolayers
  • ????

3
??
  • 1990?,???So??????,???(??)????MQW(multiple quantum
    wells)??????????(crystalline organic
    semiconductors)????
  • F. F. So, S. R. Forrest, Y. Q. Shi, and W.
    H. Steier, Appl. Phys. Lett. 56, 674 (1990).
  • ??????????????????,?????????????,????????????????
  • ?????,????????????1000 Å???10 Å,??(exciton)???????
    ?????????????????????????

4
?????MQW???OLED??
  • 1993?,????Ohmori????organic molecular beam
    deposition,???????MQW????????????(organic
    electroluminescent diodes,?organic light-emitting
    diodes)?
  • Y. Ohmori, A. Fujii, M. Uchida, C.
    Morishima, and K. Yoshino, Appl. Phys. Lett. 62,
    3250 (1993).
  • ???????x-ray diffraction?optical
    absorption?photoluminescence???,??Alq3/TPD????,???
    ??????????Alq3/TPD MQW???OLED devices,????????????

5
?????????????after Ohmori
  • ?Alq3?TPD???????,PL???????????????????LUMO?HOMO???
    ???????

6
MQW???OLED?????????????????after Ohmori
  • ????,???????,?MQWs?????????1020 nm????????

7
MQWs????
  • ?????????,?OLED???MQW??,??????????????,???????????
    ??????,?????????narrow spectral emission?higher
    emission efficiency?tunable emission spectrum????
  • 2002?4?,????Yong Qiu???MQWs??????????MQW????????,?
    ??????????,??charge balance,???????
  • Y. Qiu, Y. Gao, P. Wei, and L. Wang, Appl.
    Phys. Lett. 80, 2628 (2002).
  • ??11?,Qiu??????,????MQW????????,????????,?????????
    ?
  • Y. Qiu, Y. Gao, L. Wang, P. Wei, L. Duan, D.
    Zhang, and G. Dong, Appl. Phys. Lett. 81, 3540
    (2002).

8
?????MQWs??? after Qui
ITO/CuPc/(NPB/CuPc)n /NPB/Alq3/MgAg/Ag
  • ???MQWs????????,??(??MQW)NPB???????15
    nm,CuPc?????6 nm,??????????0?2?4?6(?)?

9
??????????????????? after Qui
  • ??????????????????????,???n4????????

10
MQWs????????????????after Qui, November 2002
a n0 b n2 c n4 d n6 e Alq3rubrene
ITO/(NPB/rubrene)n /Alq3/MgAg/Ag
  • ?????Alq3rubrene???,rubrene??????????????????,n6
    ????????????Alq3rubrene?????????,????????????????
    ????

11
??????????---Nanolayers
  • 2004?,Park??????????????,??????????(polymer-insula
    ting nanolayer)??????????????,???????,????????????
    ???,???????
  • J. H. Park, O. O. Park, J.-W. Yu, J. K.
    Kim, and Y. C. Kim, Appl. Phys. Lett. 84, 1783
    (2004).
  • ????polystyrene PS?poly(methylmethacrylate)
    PMMA ?polyethylene oxide PEO????????????????PS
    (2.5) lt ?PMMA(3.0) lt ?PEO(4.0),???????????,???????
    ?

12
????? after Park
Effective potential
V ???????? V1 ??????? V2 ??????? ? ??????
  • ???????????,????????(effective potential)????,????
    ??????????,????????????

13
?????????? after Park
  • ?????????,???????????,??????????,????(quantum
    efficiency, photons/electrons)????

14
If we want to do research on the topic
  • ?????
  • ???????,????ideas?????
  • ???????
  • ????????????,???????????

15
Thanks for your attention!!
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