Light Extraction Efficiency Enhancement of Colloidal Quantum Dot LightEmitting Diodes Using LargeScale Nanopillar Arrays
نویسندگان
چکیده
Colloidal quantum dots (QDs) offer greatly advantageous features including high emission effi ciency, [ 1,2 ] narrow emission linewidth, [ 3,4 ] tunable emission wavelength, [ 5,6 ] and low-cost solution-processing, [ 7 ] making them one of the most promising materials for lighting-emitting diodes (LEDs). Recently, current-driven quantum dot lighting-emitting diodes (QLEDs) have been intensively investigated as potential candidates for next-generation lighting and displays, and QLEDs are now competing with state-of-the-art organic LEDs (OLEDs) as well as other emerging solid-state lighting and display technologies. [ 8–16 ] However, even though a 90% internal quantum effi ciency (IQE) has been realized by using highly effi cient QD emitters, [ 8 ] the external quantum effi ciency (EQE) of QLEDs has been severely limited and is encountering a fundamental bottleneck due to the low light extraction effi ciency (LEE). [ 9 ]
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