Metal-Insulator-DBR 광학 필름을 이용한 Green QD 색변환 소자의 고색순도 및 고투과도 구현

초록

In this paper, we propose a novel optical structure based on a FPI(Fabry-Perot Interferometer), termed MID(Metal-Insulator-Distributed Bragg Reflector), to address the issue of color purity degradation in green quantum dot(QD) films used as color conversion layers. To overcome the high optical loss of the conventional FPI structure, MIM(Metal-Insulator-Metal), the proposed MID replaces the top metal reflector with a DBR(Distributed Bragg Reflector). Meanwhile, the bottom reflector remains a metal layer to ensure strong resonance. By engineering the structure to exhibit a strong resonance at a specific green wavelength, a narrow FWHM(Full Width at Half Maximum) of 19.41 nm was achieved. Moreover, owing to the high transmittance characteristics of the DBR, an optical intensity of 34,010 W/m² was realized, corresponding to an approximately 24% enhancement compared to the metal structure (27,429 W/m²). The proposed MID structure can be fabricated through a simple thin-film stacking process and is expected to enhance color reproduction in not only QD displays but also a wide range of transmissive devices requiring improved color purity.

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