Enhanced efficiency of organic light emitting devices (OLEDs) by control of laser imaging condition

Sang Hee Cho, Seung Mook Lee, Min Chul Suh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Laser Induced Thermal Imaging (LITI) is a laser addressed thermal patterning technology with unique advantages such as excellent uniformity of transfer film thickness, capability of multilayer stack transfer, high resolution and scalability to large-size mother glass. However, the deterioration of the device performance during imaging process has been an obstacle to use it as a commercial technology. To investigate a possibility of thermal deformation of organic materials as a transfer layer and a receptor layer during imaging process, we executed a preliminary annealing test by using standard green devices at various temperatures. By comparison of these results with those obtained from LITI devices, we found that the main reason of device deterioration could be originated from the mobility change of the organic layers. Hence, we developed the dwell time control technology to suppress the thermal impact during LITI process and we finally obtained current efficiency which is quite equivalent to that obtained from the standard evaporation devices.

Original languageEnglish
Pages (from-to)833-839
Number of pages7
JournalOrganic Electronics
Volume13
Issue number5
DOIs
Publication statusPublished - May 2012

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. NRF-2011-0006847 ). This research was also supported by Samsung Mobile Display – KHU OLED Research Center (Grant No. 20111029 ).

Keywords

  • Deterioration
  • Dwell time control
  • Interface
  • Laser Induced Thermal Imaging (LITI)

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