Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers

Shu Hsuan Chang, Cheng Hong Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The few reported high-contrast organic light-emitting diodes (OLEDs) all deal with bottom-emitting OLEDs and may not be readily adapted for top-emitting OLEDs (TOLEDs), which have a few technical merits over bottom-emitting devices for high-performance active-matrix OLED displays (AMOLEDs). The thin-film transistors on the back-plane of an AM substrate reduce the aperture ratio of a pixel that decreases the display brightness. A TOLED, which can provide a more flexible pixel design on an opaque AM substrate, represents a promising technique for achieving a high aperture-ratio AMOLED. In this work, the characteristics of TOLEDs with α-NPD and LiF blocking layers are numerically investigated with the APSYS simulation program. The α-NPD layer is used as an electron blocking layer, while the LiF layer is used as a hole blocking layer. The TOLED structure used in this study is based on a real device fabricated in lab by Yang et al. (Appl. Phys. Lett. 87, 143507, 2005). The simulation results indicate that when the TOLED device is with either α-NPD or LiF blocking layer, the luminance efficiency and radiative recombination rate at the same drive voltage can be markedly improved. The TOLED with α-NPD blocking layer has the best performance when the position of light emission is located at the anti-node of the standing wave due to micro-cavity effect. The TOLED with LiF blocking layer has improved performance because the LUMO of Alq3 can be lowered by band bending, which leads to better carrier balance and thus increased radiative recombination rate.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XI
DOIs
Publication statusPublished - 2007 Dec 1
EventOrganic Light Emitting Materials and Devices XI - San Diego, CA, United States
Duration: 2007 Aug 262007 Aug 29

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6655
ISSN (Print)0277-786X

Other

OtherOrganic Light Emitting Materials and Devices XI
CountryUnited States
CitySan Diego, CA
Period07-08-2607-08-29

Fingerprint

Organic light emitting diodes (OLED)
light emitting diodes
Electrons
Computer simulation
electrons
simulation
radiative recombination
Display devices
apertures
pixels
Luminance
Pixels
matrices
luminance
standing waves
light emission
brightness
Light emission
transistors
Substrates

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Chang, S. H., & Yang, C. H. (2007). Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers. In Organic Light Emitting Materials and Devices XI [66551S] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6655). https://doi.org/10.1117/12.734134
Chang, Shu Hsuan ; Yang, Cheng Hong. / Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers. Organic Light Emitting Materials and Devices XI. 2007. (Proceedings of SPIE - The International Society for Optical Engineering).
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Chang, SH & Yang, CH 2007, Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers. in Organic Light Emitting Materials and Devices XI., 66551S, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6655, Organic Light Emitting Materials and Devices XI, San Diego, CA, United States, 07-08-26. https://doi.org/10.1117/12.734134

Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers. / Chang, Shu Hsuan; Yang, Cheng Hong.

Organic Light Emitting Materials and Devices XI. 2007. 66551S (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6655).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Chang SH, Yang CH. Numerical simulation of top-emitting organic light-emitting diodes with electron and hole blocking layers. In Organic Light Emitting Materials and Devices XI. 2007. 66551S. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.734134