The effect of rare earth on color conversion properties of Cd–S–Se quantum dot embedded silicate glasses for white LED

Han, Karam; Heo, Jong; Chung, Woon Jin

doi:10.1016/j.optmat.2020.110545

Cited by 17 publications

(8 citation statements)

References 47 publications

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“…This can be achieved by reducing the emission bandwidth of the QDs, which can be adjusted by the spatial and size distribution of QDs within the glass matrix. The introduction of rare earth ions has also been used to manipulate QD size and distribution in recent studies 30 and thus with further study can also be used for pQDEGs, with a wide color gamut. Further detailed studies to clearly understand and predict the spectral change depending on various experimental parameters are also required.…”

Section: Resultsmentioning

confidence: 99%

Cd–S–Se quantum dot embedded glasses with dual emissions for wide color gamut white LED

Han

Heo

et al. 2021

Int J of Appl Glass Sci

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Cd-S-Se quantum dot embedded glasses (QDEGs) with dual-band emissions of green and red were synthesized by assembling two QDEGs, to obtain a color converter for white LEDs (wLEDs) with a wide color gamut and long-term stability. Each QDEG, possessing different sizes of QD, was prepared by adjusting heat-treatment conditions. They were then bonded to each other by an additional heat treatment to fabricate a pattern structured QDEG (pQDEG). The fabrication conditions of the pQDEGs, such as their heat-treatment condition and thickness, were varied to improve the color gamut. pQDEG-based WLEDs were demonstrated and their optical properties such as color coordinates, luminous efficiency, and color rendering index (CRI) were monitored. The effect of pQDEG fabrication conditions on the resultant emission spectra and color gamut were discussed.

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Section: Resultsmentioning

confidence: 99%

Cd–S–Se quantum dot embedded glasses with dual emissions for wide color gamut white LED

Han

Heo

et al. 2021

Int J of Appl Glass Sci

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“…Another way to make color conversion possible is the use of quantum confinement effects. Quantum confinement occurs when the charge carriers of a material are confined in a space region smaller than its Bohr exciton radius [ 24 ]. In other words, looking at the charge carriers as waves, the region of space must be smaller than the de Broglie wavelength of the electron [ 25 ], which can be quite different from material to material, and is determined by the quantum mechanical nature of the electrons and holes in the materials [ 26 ].…”

Section: Materials For Frequency Down-conversion Ledsmentioning

confidence: 99%

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

et al. 2022

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This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow–green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity.

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“…This can be accomplished by embedding QDs within an inorganic glass matrix. Various QDs, such as PbS, 26 PbSe, 27 CdS, 28 CdSe, 28 Cd-S-Se, [29][30][31] and CsPbX 3 11,32 (X = Cl, Br, and I), have been successfully formed within inorganic glasses, which were fabricated by the conventional melt-quenching method. QDs have been synthesized within glass matrix via characteristic nucleation and growth mechanism under elaborate heattreatment (HT) conditions.…”

Section: Introductionmentioning

confidence: 99%

“…QDs have been synthesized within glass matrix via characteristic nucleation and growth mechanism under elaborate heattreatment (HT) conditions. Among them, CdS or CdSe QD-embedded glasses (QDEGs) [28][29][30][31]33 have shown reasonable color conversion under 450 nm light emitting diode (LED) excitation, which suggests their potential as a color converter for white LED. For example, we reported a Cd-S-Se QDEG, which exhibited a 13% improvement in quantum yield (QY) compared to CdSe QDEG with a low QY of 3% under 450 nm LED excitation.…”

Section: Introductionmentioning

confidence: 99%

The formation mechanism of Cd–S–Se quantum dots with CdSe/CdS core–shell structure within silicate glass

et al. 2023

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The formation mechanism of Cd–S–Se quantum dots (QDs) with a CdS/CdSe core–shell structure within a silicate glass system was investigated by monitoring the change in the first excitonic absorption peak of CdSe, CdS, and Cd–S–Se QDs as a function of the heat‐treatment (HT) duration. When a silicate glass containing QD formation components for CdSe or CdS single‐phased QDs was heat‐treated, CdSe QDs grew via Ostwald ripening, whereas CdS QDs hardly formed within the given silicate glass matrix. When the glass, including CdO, ZnSe, and ZnS, was utilized for the synthesis of Cd–S–Se QDs within the glass matrix, Cd–S–Se QDs were successfully formed and exhibited similar growth behavior to CdSe QDs during the initial stage of HT. The structural changes in the QD‐embedded glasses during HT were also monitored by Raman spectroscopy and discussed, and a possible formation mechanism of CdSe/CdS core–shell‐structured QDs within silicate glasses is suggested.

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The effect of rare earth on color conversion properties of Cd–S–Se quantum dot embedded silicate glasses for white LED

Cited by 17 publications

References 47 publications

Cd–S–Se quantum dot embedded glasses with dual emissions for wide color gamut white LED

Cd–S–Se quantum dot embedded glasses with dual emissions for wide color gamut white LED

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

The formation mechanism of Cd–S–Se quantum dots with CdSe/CdS core–shell structure within silicate glass

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