POS5-1373
Polymer Matrix-Dependent Photoluminescence and Color Conversion Properties of Organic Dye-Based Films
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
JuneHyung Bae (Dept. of Polymer Science and Engineering, Dankook University)
Co-Author(s)
Abstract
Organic molecule-based color conversion layers (CCLs) have attracted considerable attention as promising alternatives to quantum dot and perovskite-based materials owing to their tunable optical properties and potential for heavy-metal-free design. In single-organic-dye-based CCLs, the dye concentration, polymer content, film thickness, and optical absorption strongly affect color conversion performance, requiring systematic optimization of the composition and film structure. The polymer microenvironment may also influence the excited-state behavior and nonradiative relaxation of the organic dye, making matrix selection an important design factor for high efficiency organic CCLs.
In this study, the concentration of the perylene-based dye Lumogen F RED was optimized, and films were fabricated under identical conditions using polystyrene (PS), poly(vinyl butyral) (PVB), and poly(styrene-block-ethylene-co-butylene-block-styrene) (SEBS) as polymer matrices. The deformability of the three polymer matrices increased in the order PS < PVB < SEBS, with PS exhibiting the most rigid mechanical behavior. The photoluminescence quantum yield (PLQY) decreased in the order PS > PVB > SEBS, indicating a tendency for matrices with lower deformability to provide higher emission efficiency. The PS-based film exhibited the longest fluorescence lifetime and relatively suppressed nonradiative relaxation behavior, suggesting that a polymer matrix with low deformability and restricted chain mobility can reduce the structural degrees of freedom around the dye and limit molecular motion and nonradiative relaxation pathways. Consequently, the PS-based film, which had the highest rigidity, exhibited a color conversion efficiency of 87.3% and a blue leakage of 58.1%, suggesting that polymer matrix control may provide an effective strategy for improving the optical performance of color conversion films.
In this study, the concentration of the perylene-based dye Lumogen F RED was optimized, and films were fabricated under identical conditions using polystyrene (PS), poly(vinyl butyral) (PVB), and poly(styrene-block-ethylene-co-butylene-block-styrene) (SEBS) as polymer matrices. The deformability of the three polymer matrices increased in the order PS < PVB < SEBS, with PS exhibiting the most rigid mechanical behavior. The photoluminescence quantum yield (PLQY) decreased in the order PS > PVB > SEBS, indicating a tendency for matrices with lower deformability to provide higher emission efficiency. The PS-based film exhibited the longest fluorescence lifetime and relatively suppressed nonradiative relaxation behavior, suggesting that a polymer matrix with low deformability and restricted chain mobility can reduce the structural degrees of freedom around the dye and limit molecular motion and nonradiative relaxation pathways. Consequently, the PS-based film, which had the highest rigidity, exhibited a color conversion efficiency of 87.3% and a blue leakage of 58.1%, suggesting that polymer matrix control may provide an effective strategy for improving the optical performance of color conversion films.
