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Size Effect and Luminescence Properties of MAPbBr3 and MAPbBr3/(OA)2PbBr4 Core-shell Materials
- Chinese Journal of Luminescence Vol. 42, Issue 1, Pages: 61-72(2021)
- 作者机构：
1.上海科技大学 物质科学与技术学院, 上海 201210
2.中国科学院 上海高等研究院, 上海 201210
- 作者简介：
- 基金信息：National Natural Science Foundation of China
DOI：10.37188/CJL.20200286
CLC： O482.31Received：29 September 2020，
Accepted：2020-10-29，
Published：2021-01
- 稿件说明：
移动端阅览
Meng-zhen CHEN, Jing SUN, Zhong-yang WANG. Size Effect and Luminescence Properties of MAPbBr3 and MAPbBr3/(OA)2PbBr4 Core-shell Materials[J]. Chinese journal of luminescence, 2021, 42(1): 61-72.
Meng-zhen CHEN, Jing SUN, Zhong-yang WANG. Size Effect and Luminescence Properties of MAPbBr3 and MAPbBr3/(OA)2PbBr4 Core-shell Materials[J]. Chinese journal of luminescence, 2021, 42(1): 61-72. DOI： 10.37188/CJL.20200286.
摘要
利用配体辅助共沉淀法和超高速离心分别制得了3种不同尺寸的甲胺溴化铅MAPbBr
3
与核壳结构MAPbBr
3
/（OA）
2
PbBr
4
（辛胺溴化铅）纳米颗粒，并对其形貌结构和发光性能进行了表征。紫外-可见吸收光谱和室温荧光（PL）光谱测试表明，因量子局限效应，MAPbBr
3
与核壳结构MAPbBr
3
/（OA）
2
PbBr
4
纳米颗粒都表现出明显的尺寸依赖带隙蓝移。低温PL光谱表明，壳层对MAPbBr
3
纳米颗粒的相变有抑制作用，声子能量随尺寸增大而增大，但与MAPbBr
3
相比，核壳结构的声子能量整体较小。时间分辨PL光谱研究表明，MAPbBr
3
纳米颗粒PL衰减呈双指数衰减，随着尺寸增大，短寿命从1.18 ns增大到1.55 ns，长寿命从4.49 ns增大到9.63 ns。而核壳结构中，由于壳层对核表面缺陷强的钝化，PL几乎呈单指数衰减，且随尺寸增大，寿命从7.34 ns增大到17.36 ns，明显高于MAPbBr
3
纳米颗粒长寿命。本文对提高MAPbBr
3
发光稳定性和实现高性能器件具有重要指导意义。
Abstract
The methylamine lead bromide MAPbBr
3
and MAPbBr
3
/(OA)
2
PbBr
4
(octylamine lead bromide) of core-shell structure nanoparticles(NPs) were synthesized by ligand-assisted co-precipitation method
and three different sizes NPs were obtained by ultra-high-speed centrifugation
respectively. Then
their morphology and photoluminescence(PL) properties were characterized. The UV-Vis absorption and room temperature PL spectra show that MAPbBr
3
and core-shell MAPbBr
3
/(OA)
2
PbBr
4
NPs both exhibit a significant size-dependent band gap blue shift due to the quantum confinement effect. The low-temperature PL spectra indicate that the shell layer could suppress the phase transition of internal MAPbBr
3
and the phonon energy increases with the increasing size. However
compared with MAPbBr
3
the phonon energy of the core-shell MAPbBr
3
NPs is smaller. The time-resolved PL measurements reveal that the PL decay of MAPbBr
3
NPs is dual exponential
and the short lifetime and long lifetime increase from 1.18 ns to 1.55 ns and from 4.49 ns to 9.63 ns with the size increasing
respectively. However
the PL decay of core-shell MAPbBr
3
/(OA)
2
PbBr
4
NPs is single exponential because the surfaces defects of core were strong passivated by the shell layer
and the long lifetime increases from 7.34 ns to 17.36 ns with the size increasing. The research of the PL properties of MAPbBr
3
NPs has important guiding significance to improve the stability and realize high-performance devices.
关键词
Keywords
references
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