Journal
NANO LETTERS
Volume 15, Issue 9, Pages 6095-6101Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02369
Keywords
Blue perovskite LED; chloride bromide perovskite; narrow FWHM; disorder; bandgap tuning
Categories
Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- Winton Programme (Cambridge) for the Physics of Sustainability
- Deutsche Forschungsgemeinschaft (NIM Excellence Cluster)
- Indo-UK APEX project
- Herchel Smith fellowship
- ERC-StG [337739-HIENA]
- European Union
- Engineering and Physical Sciences Research Council [EP/L025531/1, EP/G060738/1, EP/M005143/1, EP/M023532/1] Funding Source: researchfish
- EPSRC [EP/G060738/1, EP/M023532/1, EP/L025531/1, EP/M005143/1] Funding Source: UKRI
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Solution-processed organo-lead halide perovskites are produced with sharp, color-pure electroluminescence that can be tuned from blue to green region of visible spectrum (425-570 nm). This was accomplished by controlling the halide composition of CH3NH3Pb(BrxCl1-x)(3) [0 <= x <= 1] perovskites. The bandgap and lattice parameters change monotonically with composition. The films possess remarkably sharp band edges and a clean bandgap, with a single optically active phase. These chloride-bromide perovskites can potentially be used in optoelectronic devices like solar cells and light emitting diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs with narrow emission full width at half maxima (FWHM) and low turn on voltages using thin-films of these perovskite materials, including a blue CH3NH3PbCl3 perovskite LED with a narrow emission FWHM of 5 nm.
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