Inorganic halide perovskite quantum dot modified YAG-based white LEDs with superior performance

Abstract

Inorganic perovskite CsPbBr3−xIx(x= 0–3) QDs with tunable emission wavelength, narrow emission band and high quantum yields were synthesized. The fabricated CsPbBrI2QD-modified WLEDs show excellent performance in luminous efficacy, CCT and CRI, which are quite stable at an operational current as high as 350 mA.

Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes

“…This white‐light LED device also exhibited high CRI ( R a = 90) and CCT (6552 K). Zhou et al first used red CsPb(Br/I) 3 PQDs in a modified YAG‐based white‐light LED. Red CsPb(Br/I) 3 PQDs were mixed with PMMA in chloroform and spin‐coated on yellow‐emitting phosphor in a glass disk.…”

“…b) Photographic image. c) Chromaticity coordinates in CIE diagram (Reproduced with permission . Copyright 2016, The Royal Society of Chemistry).…”

Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

“…The significant progress that has been made for LHP‐NC‐based LEDs in terms of luminous efficiency has been offset by their unsatisfactory operational stability, leaving the potential of this cutting‐edge display technology uncertain. In principle, without directional ion migration driven by an applied electric field, LHP‐NCs that work as color converter under only optical excitation are significantly more stable, and all of the considerations concerning electrical features, e.g., charge carrier transport and injection, and related technical questions, e.g., film morphology and compatibility, can be neglected ( Table 2 ). Moreover, quasi‐2D LHP NCs, and especially the lead‐free halide double perovskite NCs that are difficult to use in LEDs, can be used appropriately in various applications under optical excitation.…”

Cesium lead halide ( CsPbX 3, X = Cl , Br, I) perovskite quantum dots-synthesis, properties, and applications: a review of their present status

“…Because of the weak binding energy of the Cs-oleate and Pb-oleate components (∼0.5 and ∼1 eV), 49 Cs-LHQDs can be easily surface modified by other ligands by replacing the oleate from the surface. Zhou et al 64 have found that the modification of Ce 3þ ∶YAG using red-emitting CsPbBrI 2 QDs enhances its luminescence efficiency of 58 lm W −1 at the operation current of 20 mA. Similarly, due to the short-exciton recombination life time (<10 ns), CsPbBr 3 QDs have extremely high modulation bandwidth (491 MHz) over traditional phosphors which is much useful for color converting applications.…”

“…This is due to the lower surface energy of f100g facets of Cs-LHQDs in solution. 64 Interestingly, Akkerman et al 65 adopted a similar kind of procedure and obtained 2 to 5 monolayers of nanoplatelike structures of CsPbBr 3 by the injection of acetone into the mixture. This acetone-based formation of nanoplate-like structures was observed during the synthesis of lead-based hybrid perovskite nanostructures earlier.…”