PDF(Pubmed)
Abstract：
In this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr3 and Cs3NdCl6 QDs via hot injection methods and mixed in various ratios at room temperature for color blending. Nd-doped CsPb(Cl/Br)3 QDs showed a blueshift in emission, and the photoluminescence quantum yields (PLQY, ΦPL) were lower in the 460-470 nm range due to surface halogen and Cs vacancies. To address this, we introduced a silane molecule, APTMS, via a ligand exchange process, effectively repairing these vacancies and enhancing Nd doping into the lattice. This modification promotes the PLQY to 94% at 466 nm. Furthermore, combining these QDs with [1]Benzothieno[3,2-b][1]benzothiophene (BTBT), a conjugated small-molecule semiconductor, in a composite film reduced PLQY loss caused by FRET in solid-state QD films. This approach achieved a wide color gamut of 124% National Television System Committee (NTSC), using a UV LED backlight and RGB perovskite QDs in a BTBT-based organic matrix as the color conversion layer. Significantly, the photostability of this composite was enhanced when used as a color conversion layer (CCL) under blue-LED excitation.
摘要：
在这项研究中,探索了用于全彩色显示器的纯蓝色发射的全无机钙钛矿量子点（QD）。我们通过热注射方法制备了CsPbBr3和Cs3NdCl6量子点，并在室温下以不同比例混合进行颜色混合。Nd掺杂的CsPb(Cl/Br)3量子点发射呈蓝移,和光致发光量子产率(PLQY，由于表面卤素和Cs空位，ΦPL）在460-470nm范围内较低。为了解决这个问题，我们引入了硅烷分子，APTMS,通过配体交换过程，有效地修复这些空位并增强Nd掺杂到晶格中。该修饰在466nm处将PLQY提高到94%。此外，将这些量子点与[1]苯并噻吩并[3,2-b][1]苯并噻吩（BTBT）组合，共轭的小分子半导体，在复合膜中减少了由固态QD膜中的FRET引起的PLQY损失。这种方法实现了全国电视系统委员会(NTSC)124%的宽色域，在基于BTBT的有机基质中使用UVLED背光和RGB钙钛矿QD作为颜色转换层。重要的是,当在蓝光LED激发下用作颜色转换层(CCL)时,该复合材料的光稳定性增强。
