Abstract
An optically efficient structure was proposed and fabricated to realize high brightness organic light emitting diode (OLED) displays based on a white OLED prepared with the air-gapped bridges on the quantum dot (QD) patterns. Compared with a conventional white OLED display, in our experiments, the optical intensity of the proposed OLED display shows the enhancement of 58.2% in the red color and 16.8% in the green color after applying the air-gapped bridge structure on QD patterns of 20 wt% concentration. This enhancement comes from the two facts that the QD patterns downconvert unnecessary blue or blue/green light to the required green or red light and the air-gapped bridges increase the color conversion efficiency of QDs by optical recycling using total internal reflection (TIR) at the interface. In addition, the color gamut of the proposed OLED display increases from 65.5 to 75.9% (NTSC x, y ratio) due to the narrow emission spectra of QDs.
Highlights
IntroductionSince the bottom glass is usually thick of around 300 μmthickness, most of this reflected light reaches to its neighbor color filter (CF) due to the relatively narrow width of subpixels with around 40 μm, resulting in low extraction efficiency
Absorption loss by the other color filter (CF) of blue and green color located near the red CF
The quantum dot (QD) patterns show a key function to downconvert the unnecessary light from the white organic light emitting diodes (OLEDs) effectively that would be cut by the CFs, while the air-gapped bridges has a key function to recycle the light to the QDs to be absorbed and downconverted again to the required color for the better brightness of OLED displays
Summary
Since the bottom glass is usually thick of around 300 μmthickness, most of this reflected light reaches to its neighbor CFs due to the relatively narrow width of subpixels with around 40 μm, resulting in low extraction efficiency. Both types of light absorption loss occur in the green subpixel. We have applied both red and green QD patterns as color downconverting components and an additional optical recycling component of air-gapped bridges to improve the optical efficiency of white OLED displays. The QD patterns show a key function to downconvert the unnecessary light from the white OLED effectively that would be cut by the CFs, while the air-gapped bridges has a key function to recycle the light to the QDs to be absorbed and downconverted again to the required color for the better brightness of OLED displays
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