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White lighting device from composite films embedded with hydrophilic Cu(In, Ga)S_2/ZnS and hydrophobic InP/ZnS quantum dots

机译:嵌入亲水性Cu(In,Ga)S_2 / ZnS和疏水性InP / ZnS量子点的复合膜的白光照明装置

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摘要

Two types of non-Cd quantum dots (QDs)—In/Ga ratio-varied, green-to-greenish-yellow fluorescence-tuned Cu?In?Ga?S (CIGS) alloy ones, and red-emitting InP ones—are synthesized for use as down-converters in conjunction with a blue light-emitting diode (LED). Among a series of Ga-rich CI_(1?x)G_xS/ZnS core/shell QDs (x = 0.7, 0.8, and 0.9), CI_(0.2)G_(0.8)S/ZnS QD is chosen for the hydrophobic-to-hydrophilic surface modification via an in-situ ligand exchange and then embedded in a water-soluble polyvinyl alcohol (PVA). This free-standing composite film is utilized as a down-converter for the fabrication of a remote-type white QD-LED, but the resulting bi-colored device exhibits a cool white light with a limited color rendering index property. To improve white light qualities, another QD-polymer film of hydrophobic red InP/ZnS QD-embedding polyvinylpyrrolidone is sequentially stacked onto the CI_(0.2)G_(0.8)S/ZnS QDPVA film, producing a unique dual color-emitting, flexible and transparent bilayered composite film. Tri-colored white QD-LED integrated with the bilayered QD film possesses an exceptional color rendering property through reinforcing a red spectral component and balancing a white spectral distribution.
机译:两种类型的非Cd量子点(QD):In / Ga比率可变,绿到黄绿色荧光调谐的Cu?In?Ga?S(CIGS)合金和发红光的InP合金。合成后可与蓝色发光​​二极管(LED)一起用作下变频器。在一系列富含Ga的CI_(1?x)G_xS / ZnS核/壳QD(x = 0.7、0.8和0.9)中,选择CI_(0.2)G_(0.8)S / ZnS QD作为疏水基通过原位配体交换进行亲水性表面修饰,然后嵌入水溶性聚乙烯醇(PVA)中。这种独立的复合膜被用作下变频器,以用于制造远程型白色QD-LED,但是所得的双色器件显示出具有有限的显色指数特性的冷白光。为了提高白光质量,将疏水性红色InP / ZnS QD嵌入聚乙烯吡咯烷酮的另一QD聚合物膜顺序堆叠在CI_(0.2)G_(0.8)S / ZnS QDPVA膜上,产生独特的双色发射,柔性且透明双层复合膜。与双层QD薄膜集成在一起的三色白色QD-LED通过增强红色光谱分量和平衡白色光谱分布而具有出色的显色性。

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