Nanoplatelet modulation in 2D/3D perovskite targeting efficient light-emitting diodes

doi:10.1039/c8nr04896g

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	Nanoplatelet modulation in 2D/3D perovskite targeting efficient light-emitting diodes
	Wu, T ; Yang, YG ; Zou, YT ; Wang, YS ; Wu, C ; Han, YJ ; Song, T ; Zhang, Q ; Gao, XY ; Sun, BQ
刊名	NANOSCALE
	2018
卷号	10 期号:41 页码:19322-19329
关键词	HALIDE PEROVSKITE HYBRID PEROVSKITE ENERGY EMITTERS VOLTAGE CSPBX3 CELLS FILMS
ISSN号	2040-3364
DOI	10.1039/c8nr04896g
文献子类	期刊论文
英文摘要	Light-emitting diodes (LEDs) based on two-dimensional (2D) perovskite nanoplatelets exhibit high electroluminescence (EL) efficiency because of the quantum confinement effect, which increases electron-hole recombination to promote radiative emission. It is well-known that a 2D nanoplatelet structure (n = 1) is detrimental for luminescence efficiency due to possible thermal quenching of excitons at room temperature. Here, a simple strategy is developed to suppress growth of NMA(2)PbBr(4) (n = 1) nanoplatelets by carefully tuning the precursor ratio of cesium bromide (CsBr), formamidinium bromide (FABr) and 1-naphthylmethylammonium bromide (NMABr). The sub-domain size of the perovskite crystal decreases as the long-chain ligand NMABr ratio increases, leading to enhanced photoluminescence quantum yields (PLQY) due to size confinement effect when the NMABr ratio is below 60%. Unfortunately, the NMA(2)PbBr(4) component in 2D/3D perovskites also grows with increasing NMABr ratio, which results in poor EL efficiency. FABr incorporation can provide additional control over suppression of NMA(2)PbBr(4) growth in 2D/3D perovskites. A compact and uniform perovskite film with reduced NMA(2)PbBr(4) content achieves PLQY of approximate to 61%. Benefiting from these features, a green perovskite LED yields current efficiency of 46.8 cd A(-1) with an external quantum efficiency of 14.9%. This study paves a new way to modulate the crystal structure in perovskites via a simple and effective method for high-performance LEDs.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31041]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, 199 Renai Rd, Suzhou 215123, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Pudong New Area, 239 Zhangheng Rd, Shanghai 201204, Peoples R China
推荐引用方式 GB/T 7714	Wu, T,Yang, YG,Zou, YT,et al. Nanoplatelet modulation in 2D/3D perovskite targeting efficient light-emitting diodes[J]. NANOSCALE,2018,10(41):19322-19329.
APA	Wu, T.,Yang, YG.,Zou, YT.,Wang, YS.,Wu, C.,...&Sun, BQ.(2018).Nanoplatelet modulation in 2D/3D perovskite targeting efficient light-emitting diodes.NANOSCALE,10(41),19322-19329.
MLA	Wu, T,et al."Nanoplatelet modulation in 2D/3D perovskite targeting efficient light-emitting diodes".NANOSCALE 10.41(2018):19322-19329.