Abstract
The electrical and optical properties of tandem organic light-emitting diodes (OLEDs), in which a fluorescent and phosphorescent emitting units are connected by an organic charge-generation layer (CGL), were experimentally analyzed. To investigate the internal properties of the tandem OLEDs, we fabricated and compared two single, two homo-tandem, and two hetero-tandem OLEDs using the fluorescent and phosphorescent units. From the experimental results of the OLEDs obtained at the same current density, the voltage across the CGL as well as the individual emission spectra and luminance of each unit of tandem OLEDs were obtained and compared with the theoretical simulation results. The analysis method proposed in this study can be utilized as a method to verify the accuracy of optical or electrical computer simulation of tandem OLED and it will be useful to understand the overall electrical and optical characteristics of tandem OLEDs.
Highlights
Tandem organic light-emitting diode (OLED) is a device that connects two or more organic light-emitting units with one or more charge-generation layers (CGLs), and allows the light-emitting units to emit light simultaneously
The tandem OLED is advantageous for applications that require long lifetime at high luminance because low current operation has the effect of improving OLED lifetime
We investigate the electrical and optical properties of a hetero-tandem OLED by comparing with those of single OLEDs and homo-tandem OLEDs which have the same light-emitting units of the heterotandem OLED
Summary
Tandem organic light-emitting diode (OLED) is a device that connects two or more organic light-emitting units with one or more charge-generation layers (CGLs), and allows the light-emitting units to emit light simultaneously. By analyzing the characteristics of the single and tandem OLEDs, it was possible to separate the combined electrical and optical properties of the hetero-tandem OLEDs into the properties of each light-emitting unit constituting the tandem OLED.
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