基于CsPbBr_3量子点与C8-BTBT复合薄膜光学稳定性的研究
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摘要
为了改善全无机钙钛矿CsPbBr_3量子点的稳定性,提出了一种基于量子点和小分子2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩的复合体系。由于CsPbBr_3量子点与小分子晶格在a,b轴方向尺寸相近,小分子材料在量子点表面产生取向外延,形成钝化层,有效抑制了光照、水汽环境下CsPbBr_3量子点表面的缺陷数量以及引起的非辐射跃迁过程。结果表明,在6天光照时间测试内,CsPbBr_3/C8-BTBT复合薄膜的荧光强度降率从99.32%降至37.42%,同时复合薄膜的荧光量子产率仍能保持初始值的44.60%;45min水汽测试时间内,复合薄膜的荧光强度降率从94.72%降至33.47%。该复合体系实现了CsPbBr_3量子点表面钝化层的生长,从而实现光照、水汽环境下的稳定性的提升。
In order to improve the stability of all inorganic perovskite CsPbBr_3 quantum dots(QDs),a composite system based on CsPbBr_3 QDs and small molecule C8-BTBT was proposed.Due to the similar lattice size of CsPbBr_3 QDs and small molecular in the a-axis and b-axis,the small molecular materials were oriented epitaxially on the QDs surface to form a passivation layer,which effectively restrained the formation of defects on the CsPbBr_3 QDs surface under light and water vapor environments as well as the resulting non-radiative transitions.The results show that the PL intensity of CsPbBr_3/C8-BTBT composite film decreased from 99.32%to 37.42%after 6 days of illumination,while the fluorescence quantum yield of the composite film still kept44.60% of the initial value.For 45 minutes water vapor test,the fluorescence reduction rate of the composite film decreased from 94.72%to 33.47%.The composite system realizes the growth of passivation layer on the CsPbBr_3 QDs surface so as to improve the stability under light and water vapor environments.
In order to improve the stability of all inorganic perovskite CsPbBr_3 quantum dots(QDs),a composite system based on CsPbBr_3 QDs and small molecule C8-BTBT was proposed.Due to the similar lattice size of CsPbBr_3 QDs and small molecular in the a-axis and b-axis,the small molecular materials were oriented epitaxially on the QDs surface to form a passivation layer,which effectively restrained the formation of defects on the CsPbBr_3 QDs surface under light and water vapor environments as well as the resulting non-radiative transitions.The results show that the PL intensity of CsPbBr_3/C8-BTBT composite film decreased from 99.32%to 37.42%after 6 days of illumination,while the fluorescence quantum yield of the composite film still kept44.60% of the initial value.For 45 minutes water vapor test,the fluorescence reduction rate of the composite film decreased from 94.72%to 33.47%.The composite system realizes the growth of passivation layer on the CsPbBr_3 QDs surface so as to improve the stability under light and water vapor environments.
引文
[1] Jaramillo-Quintero O A,Sanchez R S,Rincon M,et al.Bright visible-infrared light emitting diodes based on hybrid halide perovskite with spiro-OMeTAD as a hole-injecting layer[J].J Phys Chem Lett,2015,6(10):1883-1890.
[2] Xing J,Liu X F,Zhang Q,et al.Vapor phase synthesis of organometal halide perovskite nanowires for tunable room-temperature nanolasers[J].Nano Lett,2015,15(7):4571-4577.
[3] Zhao Y,Zhu K.Organic-inorganic hybrid lead halide perovskites for optoelectronic and electronic applications[J].Chem Soc Rev,2016,45(3):655-689.
[4] Saliba M,Matsui T,Seo J Y,et al.Cesium-containing triple cation perovskite solar cells:improved stability,reproducibility and high efficiency[J].Energy Environ Sci,2016,9(6):1989-1997.
[5] Li W,Fan J,Li J,et al.Controllable grain morphology of perovskite absorber film by molecular self-assembly toward efficient solar cell exceeding 17%[J].J Am Chem Soc,2015,137(32):10399-10405.
[6] Lightcap I V,Kamat P V.Fortification of CdSe quantum dots with graphene oxide.Excited state interactions and light energy conversion[J].J Am Chem Soc,2012,134(16):7109-7116.
[7] Makarov N S,Guo S,Isaienko O,et al.Spectral and dynamical properties of single excitons,biexcitons,and trions in cesium-lead-halide perovskite quantum dots[J].Nano Lett,2016,16(4):2349-2362.
[8] Li J,Xu L,Wang T,et al.50-fold EQE improvement up to 6.27%of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand density control[J].Adv Mater,2017,29(5):1603885.
[9] Chen J,Liu D,Al-Marri M J,et al.Photo-stability of CsPbBr3perovskite quantum dots for optoelectronic application[J].Science China Materials,2016,59(9):719-727.
[10]Li X,Wang Y,Sun H,et al.Amino-mediated anchoring perovskite quantum dots for stable and lowthreshold random lasing[J].Adv Mater,2017,29(36):1701185.
[11]Loiudice A,Saris S,Oveisi E,et al.CsPbBr3 QD/AlOxinorganic nanocomposites with exceptional stability in water,light,and heat[J].Angew Chem Int Ed Engl,2017,56(36):10696-10701.
[12]Ma K,Du X Y,Zhang Y W,et al.In situ fabrication of halide perovskite nanocrystals embedded in polymer composites via microfluidic spinning microreactors[J].Journal of Materials Chemistry C,2017,5(36):9398-9404.
[13]Jang J,Nam S,Im K,et al.Highly crystalline soluble acene crystal arrays for organic transistors:mechanism of crystal growth during dip-coating[J].Advanced Functional Materials,2012,22(5):1005-1014.
[14]Yuan Y,Giri G,Ayzner A L,et al.Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method[J].Nat Commun,2014,5:3005.
[15]Soeda J,Hirose Y,Yamagishi M,et al.Solutioncrystallized organic field-effect transistors with chargeacceptor layers:high-mobility and low-threshold-voltage operation in air[J].Adv Mater,2011,23(29):3309-3314.
[16]Protesescu L,Yakunin S,Bodnarchuk M I,et al.Nanocrystals of cesium lead halide perovskites(CsPbX(3),X=Cl,Br,and I):Novel optoelectronic materials showing bright emission with wide color gamut[J].Nano Lett,2015,15(6):3692-3696.
[17]Maity P,Dana J,Ghosh H N.Multiple charge transfer dynamics in colloidal CsPbBr3 perovskite quantum dots sensitized molecular adsorbate[J].The Journal of Physical Chemistry C,2016,120(32):18348-18354.
[18]Ling Y,Tian Y,Wang X,et al.Enhanced optical and electrical properties of polymer-assisted all-inorganic perovskites for light-emitting diodes[J].Adv Mater,2016,28(40):8983-8989.
[19]Schlegel G,Bohnenberger J,Potapova I,et al.Fluorescence decay time of single semiconductor nanocrystals[J].Phys Rev Lett,2002,88(13):137401.
[2] Xing J,Liu X F,Zhang Q,et al.Vapor phase synthesis of organometal halide perovskite nanowires for tunable room-temperature nanolasers[J].Nano Lett,2015,15(7):4571-4577.
[3] Zhao Y,Zhu K.Organic-inorganic hybrid lead halide perovskites for optoelectronic and electronic applications[J].Chem Soc Rev,2016,45(3):655-689.
[4] Saliba M,Matsui T,Seo J Y,et al.Cesium-containing triple cation perovskite solar cells:improved stability,reproducibility and high efficiency[J].Energy Environ Sci,2016,9(6):1989-1997.
[5] Li W,Fan J,Li J,et al.Controllable grain morphology of perovskite absorber film by molecular self-assembly toward efficient solar cell exceeding 17%[J].J Am Chem Soc,2015,137(32):10399-10405.
[6] Lightcap I V,Kamat P V.Fortification of CdSe quantum dots with graphene oxide.Excited state interactions and light energy conversion[J].J Am Chem Soc,2012,134(16):7109-7116.
[7] Makarov N S,Guo S,Isaienko O,et al.Spectral and dynamical properties of single excitons,biexcitons,and trions in cesium-lead-halide perovskite quantum dots[J].Nano Lett,2016,16(4):2349-2362.
[8] Li J,Xu L,Wang T,et al.50-fold EQE improvement up to 6.27%of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand density control[J].Adv Mater,2017,29(5):1603885.
[9] Chen J,Liu D,Al-Marri M J,et al.Photo-stability of CsPbBr3perovskite quantum dots for optoelectronic application[J].Science China Materials,2016,59(9):719-727.
[10]Li X,Wang Y,Sun H,et al.Amino-mediated anchoring perovskite quantum dots for stable and lowthreshold random lasing[J].Adv Mater,2017,29(36):1701185.
[11]Loiudice A,Saris S,Oveisi E,et al.CsPbBr3 QD/AlOxinorganic nanocomposites with exceptional stability in water,light,and heat[J].Angew Chem Int Ed Engl,2017,56(36):10696-10701.
[12]Ma K,Du X Y,Zhang Y W,et al.In situ fabrication of halide perovskite nanocrystals embedded in polymer composites via microfluidic spinning microreactors[J].Journal of Materials Chemistry C,2017,5(36):9398-9404.
[13]Jang J,Nam S,Im K,et al.Highly crystalline soluble acene crystal arrays for organic transistors:mechanism of crystal growth during dip-coating[J].Advanced Functional Materials,2012,22(5):1005-1014.
[14]Yuan Y,Giri G,Ayzner A L,et al.Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method[J].Nat Commun,2014,5:3005.
[15]Soeda J,Hirose Y,Yamagishi M,et al.Solutioncrystallized organic field-effect transistors with chargeacceptor layers:high-mobility and low-threshold-voltage operation in air[J].Adv Mater,2011,23(29):3309-3314.
[16]Protesescu L,Yakunin S,Bodnarchuk M I,et al.Nanocrystals of cesium lead halide perovskites(CsPbX(3),X=Cl,Br,and I):Novel optoelectronic materials showing bright emission with wide color gamut[J].Nano Lett,2015,15(6):3692-3696.
[17]Maity P,Dana J,Ghosh H N.Multiple charge transfer dynamics in colloidal CsPbBr3 perovskite quantum dots sensitized molecular adsorbate[J].The Journal of Physical Chemistry C,2016,120(32):18348-18354.
[18]Ling Y,Tian Y,Wang X,et al.Enhanced optical and electrical properties of polymer-assisted all-inorganic perovskites for light-emitting diodes[J].Adv Mater,2016,28(40):8983-8989.
[19]Schlegel G,Bohnenberger J,Potapova I,et al.Fluorescence decay time of single semiconductor nanocrystals[J].Phys Rev Lett,2002,88(13):137401.