Abstract
In this study, low-dimensional CsPbBr3@CoBr2 super-nanowire (SNW) structures were synthesized via a one-pot heating strategy for highly blue emissions. By introducing CoBr2 to CsPbBr3 precursors, the shape of perovskite nanocrystals was changed from cuboids to a super-nanowire structure, as revealed through a transmission electron microscope. SNWs were formed from stacked segments of nano-plates (lateral dimension of 10–12 nm and thickness of ~2.5 nm) with lengths of several microns. The fabricated sample absorbs light at a wavelength of <450 nm, and it is emitted at a wavelength of 475 nm. It also has a radiant flux conversion efficiency of up to 85% when stimulated by a 430 nm LED light source. The average decay time of up to 80 µs indicates that they effectively prevent the recombination of electron–hole pair. The optical performance still remains over 65% when the ambient temperature is up to 120 °C compared with that under room temperature. The excellent color purity, optical quantum efficiency, long carrier lifetime, and thermal stability make CsPbBr3@CoBr2 SNWs highly promising for a range of photolumicescence applications, such as a high color rendering index lighting and transparent blue emissive screen.
Highlights
Inorganic perovskite materials (CsPbX3 ; X = Cl, Br, I) have recently been chosen in the field of optoelectronics because their tunable bandgap energies correspond to the nearinfrared and visible light regions, convenient for optoelectronic applications [1,2,3]
The small crystals with high surface area have high surface trap state density that results in low stability and poor optical performance
High optical performance and long-time stability of low-dimensional perovskites were recently demonstrated by doping low-D perovskites into three-dimensional (3D) perovskite structures
Summary
The blue emissive nanocrystals (CsPbBrx Cl1−x ) still face great challenges because of their high reaction temperature; required PbCl2 dissolving support agents, such as trioctylphosphine; and low working performance compared to red and green counterparts [11]. Another method to fabricate blue emissive perovskite nanocrystals is to reduce the particle size with the quantum confinement effect. Low-dimensional CsPbBr3 @CoBr2 super-nanowires (SNWs) were fabricated by a simple one-pot synthesis process with strong blue emission Their structural and luminescent properties were studied by measuring PLE and PL spectra, PL efficiencies, X-ray diffraction (XRD), and transmission electron microscopy (TEM). Some prominent examples of applications of highly blue emissive CsPbBr3 @CoBr2 SNWs, including high color rendering index (CRI) light source and transparent emissive screen, were investigated
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