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Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region.
Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region.
- Source :
- Chinese Physics B; 2013, Vol. 22 Issue 4, p1-4, 4p
- Publication Year :
- 2013
-
Abstract
- We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode (OLED) by using the charge control layers (CCLs) based on Alq<subscript>3</subscript>. The CCLs that are inserted into the emitting layers (EMLs) could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm², which is about 2.19 times higher than that of the control device (CD) without the CCL, and the maximal luminance is 19.660 cd/m² at 12 V. The device shows a good color stability though the green light emitting material Alq<subscript>3</subscript> is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq<subscript>3</subscript> species. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16741056
- Volume :
- 22
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Chinese Physics B
- Publication Type :
- Academic Journal
- Accession number :
- 90156269
- Full Text :
- https://doi.org/10.1088/1674-1056/22/4/047806