Haze Controlled Glass-fabric Reinforced Quantum Dot Hybrimer Phosphor Film

Abstract

Quantum dot (QD) films are under an intense spotlight in the display or other optical construction area due to their high color purity from the narrow full width at half maximum (FWHM) and wide color gamut. On this QD film, recently, a light diffusion film (or haze film) is laminated on it in order to increase the light extraction efficiency and achieve uniform emission through the entire surface. Alternatively, a method of incorporating inorganic oxide particles such as silica, alumina or polymer particles as a scattering agent has been introduced. However, the method of further laminating the haze film has several problems such as necessity of complicated process and causing cost-effect. Incorporating particles as scattering agent has also disadvantage such as non-uniform light emission distribution in matrix due to aggregation. Previously, we reported rollable glass-fabric reinforced siloxane hybrid composite (GFRHybrimer) film for substrate of flexible devices [1]. GFRHybrimer film was fabricated by impregnation and lamination of glass-fabric with photo-curable siloxane material (Hybrimer) as matrix. Also, we fabricated siloxane encapsulated QD composite, which is exceptionally stable against heat and moisture [2]. Herein, we fabricated QD incorporated GFRHybrimer (QD-GFRHybrimer) film, which is fabricated by impregnation of glass-fabric with siloxane encapsulated QD resin as matrix. Haze of QD-GFRHybrimer film can be easily controlled by several methods; (i) tuning the refractive index by changing the composition of precursors, (ii) changing the number of glass-fabric, (iii) incorporating inorganic particles or graphene oxide as scattering agent. Thanks to haze controllable QD-GFRHybrimer film, it can achieve uniform emission through the entire surface, enhancing light extraction efficiency without an additional haze film. Furthermore, our QD-GFRHybrimer film has high thermal stability in harsh environment such as 85 oC in air and 85 oC & 85 % relative humidity conditions. Therefore, our QD-GFRHybrimer film has great potential for color enhancement film with controllable haze and thermal stability. Additionally, we will more study our QD-GFRHybrimer for improving photo-stability.