Hybrid white light-emitting devices (HWLEDs) were fabricated using FTO/PEDOT: PSS/PbS/Alq₃/Ni system and synthesized by phase separation process. In the present study, the multiple excitons generation in lead sulfide (PbS) NCs, which is characteristic of PbS NCs, was used to induce an effective and regulated energy transfer to an HWLED. The HWLED consisted of three layers successively deposited on FTO glass substrate; the first layer consisted of poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) blended with polymethyl methacrylate (PMMA) organic polymer in the 1:1 ratio, while the second layer consisted of PbS NCs. Finally, above the layer of the PbS NCs, Tris (8-hydroxyquinoline) aluminum (Alq₃) layer was deposited. The white light was generated with quite a good efficiency due to the confinement effect that makes the energy gap greater. The characteristics of the current-voltage (I-V) indicate acceptable conditions for the generation of white light by multiple excitons. It was found that the emission levels able to produce white luminescence, classified based on the coordinate system of chromaticity (CIE 1931), are x = 0.31, y = 0.33 while the correlated color temperature (CCT) is about 6250 K. The HWLEDs made from PbS NCs with hole injection from the organic polymer (PEDOT: PSS with PMMA), and electron injection from organic molecules (Alq₃) are capable of white light generation.

中文翻译：

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有机聚合物和PbS纳米晶体通过多种激子的混合白色发光器件（HWLED）

采用FTO / PEDOT：PSS / PbS / Alq ₃ / Ni体系制备了混合型白色发光器件（HWLEDs），并通过相分离法合成。在本研究中，硫化铅（PbS）NCs中的多种激子产生是PbS NCs的特征，被用于诱导有效且受调节的能量转移到HWLED。HWLED由三层依次沉积在FTO玻璃基板上组成；第一层由聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT：PSS）与聚甲基丙烯酸甲酯（PMMA）有机聚合物按1：1比例混合而成，而第二层则由PbS NCs组成。最后，在PbS NC层上方，是Tris（8-hydroxyquinoline）铝（Alq ₃）层被沉积。由于限制效应使能隙变大，白光的产生效率很高。电流-电压（IV）的特性表示通过多个激子产生白光的可接受条件。已发现，根据色度坐标系（CIE 1931）分类，能够产生白光的发射电平为x = 0.31，y = 0.33，而相关色温（CCT）约为6250K。来自PbS NCs的注入，以及来自有机聚合物的空穴注入（PEDOT：具有PMMA的PSS），以及来自有机分子（Alq ₃）的电子注入，都能够产生白光。