An organic light-emitting diode light source comprising a polyester film and a method of improving light extraction from said light source
A technology of light-emitting diodes and polyester films, applied in organic semiconductor devices, photovoltaic power generation, sustainable manufacturing/processing, etc., can solve the problems of organic stacking fragility, mechanical or chemical instability, etc., and achieve improved light extraction efficiency, increased Efficiency and economy, improving the effect of outcoupling
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Embodiment 1
[0244] Testing the extraction efficiency of the first series of bottom-emitting OLED light sources. Each OLED in the series uses the same multilayer light-emitting component, and the light profile emitted from the component is in the figure 2 shown in .
[0245] The polyester film substrate in each OLED is 100 μm thick and contains different concentrations of TiO 2 Biaxially aligned PET film of light scattering particles (P1). TiO 2 The particles have a particle size of 200 nm and are in the form of rutile crystals and are substantially spherical. During extrusion the TiO 2 Inorganic TiO dispersed in polyester 2 A concentrated masterbatch of particles was introduced into the polyester film substrate. The through-thickness index of refraction of the film-formed PET measured as described herein was about 1.5.
[0246] The organic planarization coating (OPC2) in each OLED was a cured cross-linked acrylate resin composition and had a dry thickness of 20 μm. Organic planar...
Embodiment 2
[0254] The extraction efficiency of the second series of bottom-emitting OLED light sources was tested. The OLEDs corresponded to those of Example 1, except that the inner surface of the polyester film substrate was roughened using the sandblasting technique described herein to produce a surface exhibiting roughness values Ra of 770 nm and Rq of 1140 nm and a haze of 90% (measured in isolation and on a free-standing film prior to coating the inner layers of the OLED described herein).
[0255] Figure 5 and Image 6 The maximum light output efficiency and the total light output efficiency are shown, respectively.
[0256] Figure 5 The data in confirms the data from image 3 concluded that the combination of internal and external extraction structures has the effect of increasing the maximum light output from OLEDs relative to that of OLEDs with only either extraction structure.
[0257] image 3 and Figure 5 A comparison of 2019 shows that the increased roughness of...
Embodiment 3
[0260] This example modifies Example 1 and Example 2 by changing the refractive index of the polyester film substrate to 1.65. Increasing the RI of PET from 1.5 to 1.65 requires 10 wt% non-light-scattering TiO 2 Particles (RI 2.874; size less than 60 nm). In this way, a third and fourth series of OLED light sources were produced, one with a smooth inner surface of the polyester film substrate and one with a sandblasted inner surface. Figure 7 to Figure 10 The maximum light output efficiency and the total light output efficiency of each series are shown in . The results are consistent with the conclusions of the first and second series.
[0261] The light emission profile (i.e. angular dependence) of an OLED light source comprising light-scattering particles in an amount of 0.16 vol % in each polyester film substrate and / or organic planarization layer (OPC2) was compared with that in which no light was contained in these layers. Control OLED comparison of scattering particl...
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