Suppressed angular color dispersion in planar microcavities

Abstract

We report an improved microcavity design which allows the suppression of the viewing angle dependence of the color emitted by a planar device. This is demonstrated for luminescent conjugated polymer based cavities, for which the wavelength change is reduced from ∼60 to 10 nm at an angle of 60°. We introduce the concept of cavity optical length dispersion and suggest structures for which the wavelength change with viewing angle is reduced to 5 nm at a viewing angle of 60° irrespective of the emissive material.

Dependence of the emission from tris (8-hydroxyquinoline) aluminum based microcavity on device thickness and the emission layer position

“…16 Furthermore, the splitting between TE and TM modes can occasionally cause peak splitting which is rather similar to the Rabi splitting. 18 Although previous works on the angular dependence of the emission from the Alq based microcavities showed blue shift but no peak splitting, 1-3 based on the differences in the angular dependence of the phase change upon reflection from the silver mirror for two polarizations, 5 observation of TE and TM mode splitting would not be unexpected.…”

“…[1][2][3][4][5] In addition to interest for practical applications, microcavity structures are also of interest for fundamental physics studies. In particular, strong coupling phenomena in organic microcavities are of interest due to large values of Rabi splitting which can be observed at room temperature.…”

Effects of a Dielectric Multilayer Mirror on the Lighting Efficiency of Organic Light-Emitting Diodes Studied by Optical Simulation

“…또 하나의 접근 방법은 OLED가 가지는 미소공진(microcavity) 구조를 이용하는 것이다 [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] . 배면발광형 OLED는 기본적 으로 음극인 금속과 양극인 투명전극 사이에 약한 미소공진 구조가 형성되는데, 이 때 금속이나 유전체 다층박막 등으로 공진구조를 강화시키면 OLED 발광색의 순도가 강화되어 색 재현성이 증가하거나 발광효율의 상승을 기대할 수 있다.…”

“…배면발광형 OLED는 기본적 으로 음극인 금속과 양극인 투명전극 사이에 약한 미소공진 구조가 형성되는데, 이 때 금속이나 유전체 다층박막 등으로 공진구조를 강화시키면 OLED 발광색의 순도가 강화되어 색 재현성이 증가하거나 발광효율의 상승을 기대할 수 있다. 양 극 쪽의 거울로는 얇은 금속 거울 외에 서로 다른 굴절률을 가진 물질을 교대로 형성한 다층 박막형 유전체 거울 [35][36][37][39][40][41] 이나 유전체-거울-유전체 구조 [51] 가 적용되기도 하였다. 아울러 미소공진구조에 동반되는 각도에 따른 색도와 휘도 불균일성을 해결하기 위한 다양한 시도가 있었다 [47,50] .…”

Influence of Layer Thickness to the Emission Spectra in Microcavity Organic Light Emitting Diodes

“…For example, the emission spectrum of Alq covers the range from 480 nm to 650 nm. Microcavity OLEDs have been attracting lots of attention in order to achieve spectral narrowing, brightness enhancement, or multipeak emission from the same emitting layer [1][2][3][4][5][6].…”