Abstract
ABSTRACT We demonstrate high-performance down-conversion microlens array (DC-MLA) films for white organic light-emitting diodes (OLEDs). The DC-MLA films are readily fabricated by an imprinting method based on breath figure patterns, which are directly formed on the polymer substrate with a novel concept. The DC-MLA films result in high-quality white light as well as enhanced light outcoupling efficiency for white OLEDs. The external quantum efficiency and power efficiency of OLEDs with DC-MLA films are increased by a factor of 1.35 and 1.86, respectively, compared to OLEDs without outcoupling films. Moreover, the white OLEDs with DC-MLA films achieve a high color-rendering index of 84.3. It is anticipated that the novel DC-MLA films fabricated by the simple imprinting process with breath figure patterns can contribute to the development of efficient white OLEDs.
Highlights
White organic light-emitting diodes (OLEDs) have attracted considerable attention due to their important applications in flat panel displays and general lighting [1,2,3]
We present down-conversion external outcoupling films with a high outcoupling efficiency and a high quality of white light for white OLEDs
The down-conversion microlens array (DC-MLA) films are prepared by a simple imprinting process based on breath figure patterns
Summary
White organic light-emitting diodes (OLEDs) have attracted considerable attention due to their important applications in flat panel displays and general lighting [1,2,3]. For external outcoupling, corrugated device structures [15,17], microlens array films [18,19,20,21,22,23], and micro-sphere scattering layers [16,24] have been extensively used These external outcoupling structures typically need complex and expensive lithography process to form micro-shape patterns. We develop high-performance downconversion microlens array (DC-MLA) films for down-conversion white OLEDs. The DC-MLA films are fabricated by a soft imprinting method with breath figure patterns. We expect that the novel solutionprocessable DC-MLA films based on breath figure patterns can be a simple, cost-effective approach to realize high-performance down-conversion white OLEDs
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