Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Abstract

All-inorganic perovskite CsPbBr₃ quantum dots (QDs) with an emission peak of around 520 nm were synthesized by a hot-injection method, and were systematically studied as green phosphor for light-emitting diodes (LEDs). Highly pure green light with an emission peak of 534 nm and a full-width at half-maximum (FWHM) about 20 nm was achieved using CsPbBr₃ QDs and GaN LEDs. Commission Internationale Ed I'Eclairage coordinate of the fabricated green LEDs was (0.203, 0.757). Compared to GaN LEDs, the current-voltage characteristic of the green LED did not show any degradation. Moreover, the green LEDs displayed a luminous efficiency of 31.92 lm/W under an injection current of 10 mA.

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

“…Under the illumination of the excitation light of the chips, the electrons in the NCs are excited to high-energy excited states and return to low-energy states and emit photons at the same time. [157][158][159][160] Because the narrow linewidth of perovskite NCs makes them high color purity, the phosphorconversion LEDs are widely used in the backlight source of the display device. 161,162 For the electrically driven LEDs, they generally have a sandwich structure containing anode, hole transport layer (HTL), emitting layer (EML), electron transport layer (ETL), and cathode (Figure 7).…”

III‐Nitride Nanowires as Building Blocks for Advanced Light Emitting Diodes

“…When trying to improve the LEDs efficiency in the green or red light region by QDs the use of inorganic perovskites quantum dots (IPQDs) of composition CsPbX3 (X = Cl, Br, I) has become very popular. These QDs have an excellent quantum yield of over 90%, their peak wavelength only slightly depends on variations in the QDs diameter resulting in narrow sharp spectral lines (the color is mainly determined by the QDs composition), moreover, FRET effect is relatively weak for these QDs which makes it possible to mix colors by mixing QDs with different compositions .…”

“…These QDs have an excellent quantum yield of over 90%, their peak wavelength only slightly depends on variations in the QDs diameter resulting in narrow sharp spectral lines (the color is mainly determined by the QDs composition), moreover, FRET effect is relatively weak for these QDs which makes it possible to mix colors by mixing QDs with different compositions . Such an approach has been demonstrated to be effective in producing bright green LEDs by depositing perovskite QDs or perovskite platelets on top of blue LEDs . Using nanopillar blue LEDs in this combination could be very interesting to study, particularly in conjunction with suitable LSP nanoparticles (both types of nanoparticles blended with polymer layer placed in‐between the nanopillars).…”

Silver nanoparticles enhanced luminescence and stability of CsPbBr3 perovskite quantum dots in borosilicate glass

“…Therefore, CsPbX 3 quantum dots have great application potential in quantum dot lasers, photodetectors, light-emitting diodes (LEDs), and solar cells. [1][2][3][4][5][6][7][8][9] There have been many routes to prepare this type of semiconductor material, including thermal injection, 10 ligand-assisted supersaturation recrystallization, 11 a microwave-assisted method, 12 and an ion exchange method. 13 Although perovskite quantum dots possess excellent optical properties, their poor stability limits their practical application.…”