Synthesis of widely emission-tunable Ag–Ga–S and its quaternary derivative quantum dots

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

“…Tetragonal AgInS 2 exhibited narrower band-edge emission (full width at half maximum, FWHM = 32.2 nm) and higher photoluminescence (PL) quantum yield (QY) (49.2%) than those of the orthorhombic AgInS 2 nanoparticles (FWHM = 37.8 nm, QY = 33.3%). Additional surface passivation by alkylphosphine resulted in higher PL QY (72.3%) with a narrow spectral shape.in the visible region as well as large optical absorption coefficients, which are characteristic for direct semiconductors [9][10][11][12][13]. Among these QDs, silver indium sulfide (AgInS 2 ) nanoparticles (NPs) with a band gap energy of 1.87 eV have attracted increasing attention [14,15].…”

“…in the visible region as well as large optical absorption coefficients, which are characteristic for direct semiconductors [9][10][11][12][13]. Among these QDs, silver indium sulfide (AgInS 2 ) nanoparticles (NPs) with a band gap energy of 1.87 eV have attracted increasing attention [14,15].…”

Synthesis and structure design of I–III–VI quantum dots for white light-emitting diodes

“…Therefore, the group I-deficient strategy (with reduced Cu/In or Ag/In ratio) can improve the recombination rate of carriers and significantly improve the luminescence intensity of QDs. [56][57][58][59] In addition, doping strategies have also been used to enhance the fluorescence and broaden the spectrum of QDs.…”

Single-source precursor synthesis of quinary AgInGaZnS QDs with tunable photoluminescence emission

“…One of the key advantages of I-II-III-VI2 QDs is their high degree of compositional flexibility by varying monovalent and/or trivalent cations which allows to finely tune their bandgap energy and thus the photoluminescence (PL) emission wavelength over all the whole visible region and even in the near infrared [1][2][3][4][5]. In recent years, various quaternary compositional and structural variants such as green to orange emitting CuInGaS2 [19,20], green to red emitting CuGaZnS2 [21] or CuGaZnSe2 [22], blue to orange emitting Mn 2+ -doped CuGaZnS2 [23,24], violet to aqua emitting AgGaZnS2 [25,26] or blue to orange-emitting AgGaInS2 [27,28] have been reported. Only one report describes the synthesis of quinary CuGaInZnS2 QDs [19].…”

“…The PL emission of these dots was demonstrated to be tunable from the orange to the red by varying the Cu/Ga molar ratio. The synthesis of previously mentioned quaternary and quinary nanocrystals is classically performed like that of AIZS and CIZS QDs by thermal decomposition of metal salts or organometallic precursors in the presence of S or Se precursors using dodecanethiol, oleylamine (OAm) or ethylenediamine as capping ligand [19][20][21][22][23][24][25][26]28]. AgInS2 QDs were also used as template to prepare AgGaInS2 by cation exchange between In 3+ and Ga 3+ [27].…”