银和铟掺杂的CdTe胶体量子点生长动力学研究

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-05-10 DOI:10.1016/j.jphotochem.2025.116492

Vijayaraj Venkatachalam , Sasikala Ganapathy , Ilaiyaraja Perumal , Priyadarshini N , Santhosh Jeferson Joseph Stanley , Davis Jacob Inbaraj

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引用次数: 0

摘要

以3-巯基丙酸（3-MPA）为封盖剂，采用水溶胶法制备了CdTe量子点。银（Ag+）掺杂加速了晶体的生长，导致CdTe量子点的红移，而铟（In3+）掺杂在3-巯基丙酸（3-MPA）封盖剂的作用下，由于在InCl3前驱体中自由氯离子的生长受到控制，导致了轻微的蓝移。随着回流时间的增加，颗粒尺寸也随之增大，导致带隙逐渐缩小：CdTe从2.67 eV到2.15 eV， In掺杂CdTe （In:CdTe）从2.7 eV到2.19 eV， Ag掺杂CdTe （Ag:CdTe）从2.37 eV到1.74 eV。在CdTe量子点中掺杂In3+引入了一个浅能级，而Ag+掺杂在导带以下产生了浅能级和深能级。实现了从深绿色到深红色的排放调谐，有效地解决了“绿色鸿沟”。吸收光谱显示CdTe和in:CdTe量子点中s态和p态饱和，而Ag:CdTe量子点显示额外的d态填充。两种掺杂剂都提高了光学质量和光致发光性能。利用蓝色发光的有机荧光团、绿色发光的In:CdTe（1%）和红色发光的Ag:CdTe（5%）量子点，开发了白光纳米复合材料。优化后的混合产生的白光具有CIE坐标（0.33,0.34），相关色温（CCT）为5181 K，显色指数（CRI）为87，显示出未来白光LED和显示应用的强大潜力。

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Tailoring CdTe colloidal quantum dots growth kinetics with Ag and In dopants for dazzling white-light emission

CdTe quantum dots (QDs) were synthesized using an aqueous colloidal method with 3-mercaptopropionic acid (3-MPA) serving as the capping agent. Silver (Ag⁺) doping accelerates crystal growth and causes a red shift in CdTe QDs, while indium (In³⁺) doping leads to a slight blue shift due to controlled growth from free chloride ions in InCl₃ precursor, in conjunction with the 3-mercaptopropionic acid (3-MPA) capping agent. As the reflux time increases, particle size grows accordingly, leading to a progressive narrowing of the bandgap: from 2.67 to 2.15 eV for CdTe, 2.7 to 2.19 eV for In-doped CdTe (In:CdTe), and 2.37 to 1.74 eV for Ag-doped CdTe (Ag:CdTe). In³⁺ doping in CdTe QDs introduce a shallow level, while Ag⁺ doping creates both shallow and deep levels below the conduction band. Emission tuning from deep green to deep red was achieved, effectively addressing the “green gap.” The absorption spectra revealed s- and p-state saturation in CdTe and In:CdTe QDs, whereas Ag:CdTe QDs exhibited additional d-state filling. Both dopants enhanced the optical quality and photoluminescence. A white-light nanocomposite was developed using a blue-emitting organic fluorophore, green-emitting In:CdTe (1 %), and red-emitting Ag:CdTe (5 %) QDs. Optimized mixing produced white light with CIE coordinates (0.33, 0.34), a correlated color temperature (CCT) of 5181 K, and a color rendering index (CRI) of 87 demonstrating strong potential for future white LED and display applications.

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.