Dual-Color Emission from Spatially Distributed Quantum Dots in Poly(l-lactide) Films with Diverse Morphologies,ACS Macro Letters

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Dual-Color Emission from Spatially Distributed Quantum Dots in Poly(l-lactide) Films with Diverse Morphologies
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-10-25 , DOI: 10.1021/acsmacrolett.2c00428
Lakshmi Vijaya ₁ , Sruthi Suresh _{1,

2} , Rajkumar Patel ₃ , E Bhoje Gowd _{1,

2}

Affiliation

Polymer-based multicolor emissive materials have growing demand due to their potential applications in various fields such as full-color displays, bioimaging, and light sources because of their processability and high stability. Herein, we report dual-color emissive hybrid materials based on biocompatible poly(l-lactide) and polyethylene glycol-modified two-dimensional layered double hydroxide quantum dots (PEG-LDHQDs). The morphology of polymer films tunes the spatial distribution of QDs within the polymer matrix, modulating the energy transfer between the QDs and affording the dual emission behavior in the aggregated states. The amorphous hybrid films show single emission (blue) from the finely dispersed QDs (mostly isolated) within the polymer matrix. In contrast, dual emission (blue and red) was observed when the polymer was crystallized due to the possible accumulation of QDs at the interface of crystalline and amorphous phases in the lamellar structure. Furthermore, the dual emission could be enhanced by the aggregation of QDs on the pores of the breath figure pattern constructed on the surface of the hybrid film.

中文翻译：

具有不同形态的聚（l-丙交酯）薄膜中空间分布的量子点的双色发射

聚合物基多色发光材料由于其可加工性和高稳定性，在全彩显示器、生物成像和光源等各个领域具有潜在的应用前景，因此需求不断增长。在此，我们报道了基于生物相容性聚（ l-丙交酯）和聚乙二醇改性的二维层状双氢氧化物量子点（PEG-LDHQD）的双色发射混合材料。聚合物薄膜的形态调节聚合物基质内量子点的空间分布，调节量子点之间的能量转移并在聚集态下提供双发射行为。无定形混合薄膜显示出来自聚合物基质内精细分散的量子点（大部分是孤立的）的单发射（蓝色）。相反，当聚合物结晶时，由于层状结构中的结晶相和非晶相界面处可能积累了量子点，因此观察到双发射（蓝色和红色）。此外，通过在混合薄膜表面构建的呼吸图形图案的孔上聚集量子点可以增强双发射。

更新日期：2022-10-25

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