Efficient and Spectrally Stable Blue Perovskite Light-Emitting Diodes Based on Potassium Passivated Nanocrystals

Funding Agencies|NSFC/ChinaNational Natural Science Foundation of China [51727809]; Wuhan Science and Technology Bureau [2019010701011406]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2017M620321]
Metal halide perovskites have aroused tremendous interest in the past several years for their promising applications in display and lighting. However, the development of blue perovskite light-emitting diodes (PeLEDs) still lags far behind that of their green and red cousins due to the difficulty in obtaining high-quality blue perovskite emissive layers. In this study, a simple approach is conceived to improve the emission and electrical properties of blue perovskites. By introducing an alkali metal ion to occupy some sites of peripheral suspended organic ligands, the nonradiative recombination is suppressed, and, consequently, blue CsPb(Br/Cl)(3) nanocrystals with a high photoluminescence quantum efficiency of 38.4% are obtained. The introduced K+ acts as a new type of metal ligand, which not only suppresses nonradiative pathways but also improves the charge carrier transport of the perovskite nanocrystals. With further engineering of the device structure to balance the charge injection rate, a spectrally stable and efficient blue PeLED with a maximum external quantum efficiency of 1.96% at the emission peak of 477 nm is fabricated.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
charge injection; defects passivation; perovskite light-emitting diodes; spectrally stable; surface ligands

Chen, HongtingLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten,Huazhong Univ Sci and Technol, Peoples R China(Swepub:liu)honch37 (författare)
Zhang, RuiHuazhong Univ Sci and Technol, Peoples R China (författare)
Liu, XiaokeLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten(Swepub:liu)xiali81 (författare)
Zhang, WeizhuoHuazhong Univ Sci and Technol, Peoples R China (författare)
Zhang, JiBinHuazhong Univ Sci and Technol, Peoples R China (författare)
Gao, FengLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska fakulteten(Swepub:liu)fenga88 (författare)
Wang, LeiHuazhong Univ Sci and Technol, Peoples R China (författare)
Huazhong Univ Sci and Technol, Peoples R ChinaBiomolekylär och Organisk Elektronik (creator_code:org_t)

Ingår i:Advanced Functional Materials: WILEY-V C H VERLAG GMBH30:101616-301X1616-3028

Av författaren/redakt...: Yang, Fei; Chen, Hongting; Zhang, Rui; Liu, Xiaoke; Zhang, Weizhuo; Zhang, JiBin; visa fler...; Gao, Feng; Wang, Lei; visa färre...

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