By engineering a one-atom thick sheet of chlorine onto the surface of an existing industry-standard electrode material (indium tin oxide, ITO) found in today’s flat-panel displays, these researchers have created a medium that allows for efficient electrical transport while eliminating the need for several costly layers found in traditional OLED devices.
The University of Toronto team tested their green-emitting “Cl-OLED” against a conventional OLED and found that the efficiency was more than doubled at very high brightness. “OLEDs are known for their high-efficiency,” describes Helander. “However, the challenge in conventional OLEDs is that as you increase the brightness, the efficiency drops off rapidly.” Using their chlorinated ITO, this team of advanced materials researchers found that they were able to prevent this drop off and achieve a record efficiency of 50% at 10,000 cd/m2 (a standard florescent light has a brightness of approximately 8,000 cd/m2), which is at least two times more efficient than the conventional OLED.
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