Deep Blue Layered Lead Perovskite Light‐Emitting Diode

Yan, Siyu; Tian, Wanli; Chen, Hua; Tang, Kaixin; Lin, Tingting; Zhong, Gaoyu; Qiu, Longzhen; Pan, Xiaoyong; Wang, Wei Zhi

doi:10.1002/adom.202001709

Cited by 30 publications

(24 citation statements)

References 45 publications

(46 reference statements)

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“…A few results nevertheless indicate that optical tunability and homogeneous emission lines may be obtained when using halide binary alloys thanks to the robustness of the 2D Wannier exciton for the [100] orientation . Synthetically, the majority of the materials reported are monolayer ( n = 1) 2D bromide perovskites. ,− A significant amount of the studied monolayer lead bromide perovskites adopt the [110] orientation, which exhibit broadband emission due to photogenerated energy distribution of self-trapped exciton states that are associated with the distortion of the [110] corrugated structure. − …”

Section: Introductionmentioning

confidence: 99%

Shedding Light on the Stability and Structure–Property Relationships of Two-Dimensional Hybrid Lead Bromide Perovskites

et al. 2021

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hybrid lead iodide perovskites have gained prominence due to their remarkable structural tunability, optoelectronic features, and moisture stability, which have rendered them as attractive alternatives to 3D MAPbI 3 for optoelectronic devices. 2D multilayer lead bromide perovskites remain an unfathomed phase space with the lack of systematic studies to establish the structure, photophysical properties and stability behavior of this family of 2D halide perovskites. Herein, we present new m e m b e r s o f b i l a y e r l e a d b r o m i d e p e r o v s k i t e s (C m H 2m+1 NH 3 ) 2 (CH 3 NH 3 )Pb 2 Br 7 (m = 6−8) that belong to the Ruddlesden−Popper structure type, incorporating long chain alkylmonoammonium cations (C m H 2m+1 NH 3 ) of hexylammonium (m = 6), heptylammonium (m = 7), and octylammonium (m = 8). A universal solution synthetic methodology for bulk multilayer lead bromide perovskites is presented with all structures solved and refined using single crystal X-ray diffraction. The studied bilayer lead bromide perovskites demonstrate a decrease in the lattice rigidity and lattice match of the inorganic perovskite layer−organic layer, as the alkyl-monoammonium chain length increases. In comparison to their iodide analogues, the bilayer lead bromide compounds exhibit elongation of their stacking axis despite the smaller dimensions of the [PbBr 6 ] 4− lattice, while their internal lattice strain was calculated to be reduced, inferring a greater lattice match between the inorganic [PbBr 6 ] 4− perovskite layer and organic layer. The (C m H 2m+1 NH 3 ) 2 (CH 3 NH 3 )Pb 2 Br 7 (m = 4, 6−8) compounds exhibit narrow-band emission near 2.5 eV. Time-resolved photoluminescence (PL) displays longer carrier lifetimes on the nanosecond time scale comparing to their iodide analogues, where electronic structure calculations indicate that the increase of the alkyl chain length and, thus, lattice softness enhances nonradiative recombinations. A complete set of air, light, and heat stability tests on unencapsulated thin films of (C m H 2m+1 NH 3 ) 2 (CH 3 NH 3 )Pb 2 Br 7 (m = 4, 6−8) and MAPbBr 3 show they are stable in ambient air for at least 5 months, exhibiting greater extrinsic stability than the 2D lead iodide congeners. Extraordinarily, 3D MAPbBr 3 films prove to be more stable than films of 2D lead bromide perovskites, in contrast to MAPbI 3 which is less stable than the 2D lead iodide perovskites.

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Section: Introductionmentioning

confidence: 99%

Shedding Light on the Stability and Structure–Property Relationships of Two-Dimensional Hybrid Lead Bromide Perovskites

et al. 2021

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“…Yan et al synthesized a stable pure layered (benzimidazole) 2 PbBr 4 (BI 2 PbBr 4 ) perovskite via the strong π–π interaction between benzene rings of the BI ligand, leading to the 2D‐layered perovskite film with a PLQY of 80% and the deep‐blue PeLED ( λ EL = 445 nm) with an EQE max of 3.08% and a L max of 1315 cd m −2 . [ 61 ]…”

Section: Challenges and Strategies For Blue Peledsmentioning

confidence: 99%

Strategies to Improve Luminescence Efficiency and Stability of Blue Perovskite Light‐Emitting Devices

et al. 2021

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Metal halide perovskite materials hold great potential as a core element in full‐color display and lighting applications due to their unique optoelectronic properties, such as high photoluminescence efficiency, good color purity, tunable bandgap, and low‐temperature solution processability. However, the performance of blue perovskite light‐emitting diodes (PeLEDs) lags far behind their red and green counterparts, impeding their practical use. Herein, the recent progress on blue PeLEDs based on different restrictions and some feasible strategies to improve luminescence efficiency and stability are summarized. The methods to optimize blue‐emission perovskite materials with different dimensions are addressed. The major factors affecting luminescence stability, the approaches to balance charge injection and minimize the optical loss are also discussed. Several problems in blue PeLEDs, particularly the toxicity of lead‐based perovskites and the alternative solutions of lead‐free perovskites, are emphasized. Finally, the perspective of future development in blue PeLEDs is provided.

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“…In general, the possible elements for B‐site substitution include tin (Sn), germanium (Ge), antimony (Sb), strontium (Sr), calcium (Ca), manganese (Mn), copper (Cu), zinc (Zn), cerium (Ce), yttrium (Y), neodymium (Nd), ytterbium (Yb), europium (Eu), and so on. [ 18–30 ] So far, although some works have summarized the influence of B‐site doping in perovskite, the benefit in respect of reducing toxicity was ignored. [ 31–33 ] Similarly, several review articles have been published on different kinds of lead‐free perovskite materials and their applications.…”

Section: Introductionmentioning

confidence: 99%

Environment‐Friendly Perovskite Light‐Emitting Diodes: Progress and Perspective

Wang

Lou

et al. 2022

Adv Materials Inter

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Metal halide perovskite materials have shown excellent optoelectronic properties suitable for light‐emitting diodes. With the development of technology in recent years, the performance of perovskite light‐emitting diodes (PeLEDs) has been improved rapidly, which can be almost comparable with that of the organic light‐emitting diodes (OLEDs) and quantum‐dot light‐emitting diodes counterparts. However, the toxicity of lead in perovskites may be unacceptable to consumers, which severely hinders the commercial applications of PeLEDs. Therefore, massive efforts on more environment‐friendly PeLEDs should be invested, prompting them potential candidates for next‐generation display devices. In this review, the synthesis methods and preparation processes of perovskite emitting layers that are successfully utilized in environment‐friendly PeLEDs are first summarized. Then, a comprehensive analysis of development on the applications of both less‐lead and lead‐free PeLEDs is reported. Finally, the possible strategies to further improve the performance of environment‐friendly PeLEDs are given.

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Deep Blue Layered Lead Perovskite Light‐Emitting Diode

Cited by 30 publications

References 45 publications

Shedding Light on the Stability and Structure–Property Relationships of Two-Dimensional Hybrid Lead Bromide Perovskites

Shedding Light on the Stability and Structure–Property Relationships of Two-Dimensional Hybrid Lead Bromide Perovskites

Strategies to Improve Luminescence Efficiency and Stability of Blue Perovskite Light‐Emitting Devices

Environment‐Friendly Perovskite Light‐Emitting Diodes: Progress and Perspective

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