纯化试剂对CdSe/ZnS绿色量子点膜光学稳定性的影响
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摘要
通过热注射法制备高质量的CdSe/ZnS绿色量子点,采用不同配方的醇和烷烃作为洗涤溶剂通过沉淀法纯化量子点粗产品,并制备基于液晶显示器的量子点光学转换膜。通过色彩分析仪检测分析,研究在高温、高湿、蓝光照射条件下量子点膜的光学稳定性。采用核磁共振氢谱等方法和技术对纯化后量子点的表面配体进行分析。实验结果表明,不同的纯化试剂改变了量子点表面油酸及三辛基氧膦配体数量,从而影响了量子点膜的光学稳定性。
Highly luminescent CdSe/ZnS quantum dots were synthesized by hot injection method and further purified with the different alkanes and alcohols to prepare the quantum dot optical conversion films used in liquid crystal display. The optical stability of the quantum dots film under the conditions of high temperature,high humidity and blue light irradiation was investigated by color analyzer. The surface ligands of quantum dots were also characterized by nuclear magnetic resonance spectroscopy. The experimental results show that the number of oleic acid and trioctyl oxyphosphine ligands on the surface of quantum dots changes with the different purified reagents,influencing the optical stability of the quatum dot films.
Highly luminescent CdSe/ZnS quantum dots were synthesized by hot injection method and further purified with the different alkanes and alcohols to prepare the quantum dot optical conversion films used in liquid crystal display. The optical stability of the quantum dots film under the conditions of high temperature,high humidity and blue light irradiation was investigated by color analyzer. The surface ligands of quantum dots were also characterized by nuclear magnetic resonance spectroscopy. The experimental results show that the number of oleic acid and trioctyl oxyphosphine ligands on the surface of quantum dots changes with the different purified reagents,influencing the optical stability of the quatum dot films.
引文
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[4] KAGAN C R,LIFSHITZ E,SARGENT E H,et al.Building devices from colloidal quantum dots[J].Science,2016,353(6302):aac5523(1)-aac5523(9).
[5] ZHOU R, YANG Z, XU J Z, et al. Synergistic combination of semiconductor quantum dots and organic-inorganic halide perovskites for hybrid solar cells[J]. Coordination Chemistry Reviews,2018,374:279-313.
[6] FINLEY J J,SKALITZ M,ARZBERGER M,et al.Electrical detection of optically induced charge storage in self-assembled InAs quantum dots[J]. Applied Physics Letters,1998,73(18):2618-2620.
[7] SRINIVASAN V,HIRAGOND C B,KHANNA P K,et al. Surface engineering of CdS quantum dots for photocatalytic applications under direct sunlight[J].Chemistry Select,2018,3(29):8491-8500.
[8] HAMES B C,MORA-SERóI,SáNCHEZ R S,et al.Device performance and light characteristics stability of quantum-dot-based white-light-emitting diodes[J].Nano Research,2018,11(3):1575-1588.
[9] TODESCATO F,FORTUNATI I,MINOTTO A,et al.Engineering of semiconductor nanocrystals for light emitting applications[J]. Materials,2016,9(8):672(1)-672(28).
[10] ZHANG Q,NIE C,CHANG C,et al. Highly luminescent red emitting CdZnSe/ZnSe quantum dots synthesis and application for quantum dot light emitting diodes[J].Optical Materials Express,2017,7(11):3875-3884.
[11] CHEN E G,XIE H X,HUANG J M,et al. Flexible/curved backlight module with quantum-dots microstructure array for liquid crystal displays[J].Optics Express,2018,26(3):3466-3481.
[12] KO Y H,JALALAH M,LEE S J,et al. Super ultra-high resolution liquid-crystal-display using perovskite quantum-dot functional color-filters[J]. Scientific Reports,2018,8:12881(1)-12881(7).
[13] SALDANHA P L,LESNYAK V,MANNA L. Large scale syntheses of colloidal nanomaterials[J]. Nano Today,2017,12:46-63.
[14] PECHSTED K,WHITTLE T,BAUMBERG J,et al.Photoluminescence of colloidal CdSe/ZnS quantum dots:the critical effect of water molecules[J]. The Journal of Physical Chemistry C,2010,114(28):12069-12077.
[15] YANG Y,LI J Z,LIN L,et al. An efficient and surface-benign purification scheme for colloidal nanocrystals based on quantitative assessment[J].Nano Research,2015,8(10):3353-3364.
[16] PETRIS D,FREITAS D V,SNTOS R K V D,et al.Purification processes of cadmium based quantum dots in aqueous medium a comparative study[J]. Material Research Express,2017,4(7):5048(1)-5048(12).
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[18] LIM H,WOO J Y,LEE D C,et al. Continuous purification of colloidal quantum dots in large-scale using porous electrodes in flow channel[J]. Scientific Reports,2017,7:43581(1)-43581(7).
[19] SHEN Y, WEERANOPPANANT N, XIE L S,et al. Multistage extraction platform for highly efficient and fully continuous purification of nanoparticles[J].Nanoscale,2017,9(23):7703-7707.
[20] BAE W K,CHAR K,HUR H,et al. Single-step sythesis of quantum dots with chemical composition gradients[J]. Chemical Materials,2008,20(2):531-539.
[21] MORRIS-COHENAJ,DONAKOWSKIMD,KNOWLES K E,et al. The effect of a common purification procedure on the chemical composition of the surfaces of CdSe quantum dots synthesized with trioctylphosphine oxide[J]. The Journal of Physical Chemistry C,2010,114(2):897-906.
[22] QU L H,PENG X G. Control of photoluminescence properties of CdSe nanocrystals in growth[J]. Journal of the American Chemical Society,2002,124(9):2049-2055.
[23] KONG L Q,ZHANG L,MENG Z H,et al. Ultrastable,highly luminescent quantum dot composites based on advanced surface manipulation strategy for flexible lighting-emitting[J]. Nanotechnology,2018,29(31):5203(1)-5203(25).
[24] YUAN L,PATTERSON R, WEN X M, et al.Investigation of anti-solvent induced optical properties change of cesium lead bromide iodide mixed perovskite(CsPbBr3-x Ix)quantum dots[J]. Journal of Colloid and Interface Science,2017,504:586-592.
[25] ZHEREBETSKYY D, SCHEELE M,ZHANG Y J,et al. Hydroxylation of the surface of PbS nanocrystals passivated with oleic acid[J]. Science,2014,344(6190):1380-1384.
[26] ZENG B R, PALUI G,ZHANG C Q, et al.Characterization of the ligand capping of hydrophobic case-zns quantum dots using NMR spectroscopy[J].Chemical of Materials,2018,30(1):225-238.