Promoting the doping efficiency and photoluminescence quantum yield of Mn-doped perovskite nanocrystals via two-step hot-injection

Abstract

Manganese doped perovskite nanocrystals (NCs) have been synthesized by a novel two-step hot injection strategy with an unprecedented Mn doping efficiency of 48.5%, bright orange emission under ultraviolet light and...

Chemical coupling of halide perovskite nanocrystals with a metal quinolate complex for white light generation

“…2B–D and Table S2, ESI†). 14–20 This clearly describes the near-perfect white light nature of the present CaQ 2 -HPNC nanocomposite and is much better than those of their individual components (Table S2, ESI†). The absorption edge at 400 nm of Mn 2+ -doped CsPbCl 3 HPNCs remains unaltered upon coupling with the CaQ 2 complex to form the WLE nanocomposite (Fig.…”

“…Here the blue (405 nm) and orange (585 nm) emissions of Mn 2+ -doped CsPbCl 3 PNCs originated from their intrinsic excitonic radiative recombination of CsPbCl 3 and Mn 2+ dopants 4 T 1 – 6 A 1 electronic transition. 18–20 In contrast, cyan luminescence, with emission maxima centered at 464 nm, is observed for the solid CaQ 2 complex (Fig. S2, ESI†).…”

“…In the multitude of optoelectronic uses of HPNCs, the case of the construction of white light emitting (WLE) material, with properties close to those of bright midday sunlight, stands out as an important one for indoor illumination and to partly alleviate the world-wide energy calamity issues. [12][13][14][15][16][17][18][19][20] Notably, bright midday sunlight shows chromaticity coordinates of (0.33, 0.33) (defining the quality and purity), correlated color temperature (CCT; defining the warm/cool nature) in the range of 5000-6000 K and color rendering index (CRI; describing the ability of light sources to present real object colors) value near to 75. [12][13][14][15][16][17][18][19][20] Parenthetically, the mixing of red and green emitting polymer coated metal halide perovskites (MHPs), single broad band emitting (in the range of 400-700 nm) MHPs and coating of yellow emitting MHPs on blue LEDs have been adopted to make various WLE materials.…”

“…[12][13][14][15][16][17][18][19][20] Notably, bright midday sunlight shows chromaticity coordinates of (0.33, 0.33) (defining the quality and purity), correlated color temperature (CCT; defining the warm/cool nature) in the range of 5000-6000 K and color rendering index (CRI; describing the ability of light sources to present real object colors) value near to 75. [12][13][14][15][16][17][18][19][20] Parenthetically, the mixing of red and green emitting polymer coated metal halide perovskites (MHPs), single broad band emitting (in the range of 400-700 nm) MHPs and coating of yellow emitting MHPs on blue LEDs have been adopted to make various WLE materials. [13][14][15][16][17] Similarly, white light emission can be obtained from a mixture of green emitters (such as CsPbBr 3 @Cs 4 PbBr 6 /SiO 2 NC composites, ligand modified CsPbBr 3 /SiO 2 QDs and Cs 3 Cu 2 Cl 5 @Silica Nanocrystals) and red emitters (InAgZnS QDs and CaAlSiN 3 :Eu 2+ phosphors) followed by coating on blue LED/UV chips.…”

“…[21][22][23][24][25] In recent times, the Mn 2+ doped CsPbX 3 HPNCs (X = Cl/Br) have demonstrated their optoelectronic uses (particularly on fabricating WLE materials) due to their high quantum efficacy and orange-red luminescence -originated from Mn 2+ d-d transition ( 4 T 1 -6 A 1 ) via energy transfer from the host excitons to Mn 2+ dopants. [18][19][20] Accordingly, the synthetic strategies, such as co-doping of Bi 3+ and Mn 2+ ions in CsPbCl 3 HPNCs, AlCl 3 assisted modification of Mn 2+ doped CsPbCl 3 HPNCs and mixing of Mn 2+ doped CsPbCl 3 HPNCs with their bromide exchanged forms, have been adopted to generate white light. [18][19][20] Nevertheless, the precise control over the desired WLE parameters during the synthesis of the aforementioned WLE materials is challenging -in addition to their stability issue at normal atmosphere.…”