Electroluminescence characteristics of organic thin film pumped by pulsed excitation

✍ Scribed by Wenqing Zhu; Zhengyu Gan; Bin Wei; Xiaowen Zhang; Zhilin Zhang; Xueyin Jiang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 379 KB
• Volume: 42
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2009.11.001

✦ Synopsis

The current roll-off in organic light-emitting diodes has been studied by observing the current density versus voltage characteristics and spectra of single-layer and bilayer devices. Pumped by radiation sources of a variety of intensities, the current densities in a single-layer device decrease and spectra were shifted towards blue region. This is a result of the large amount of excess anion radicals that absorb the emitted photons. Using a bilayer device to balance the excess anion radicals is one of the methods to restrain the current roll-off.