Formulating CdSe quantum dots for white light-emitting diodes with high color rendering index

Li, Fēi; Li, Wannan; Fu, Shao‐Yun; Xiao, Hong‐Mei

doi:10.1016/j.jallcom.2015.05.232

Cited by 27 publications

(8 citation statements)

References 42 publications

(46 reference statements)

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“…Recently, a number of quantum dots, such as ZnAgInS, CuInS, CdSe/ZnS and PbSe, have been applied as color converter for white LEDs and near-infrared LEDs, since they have advantages of tunable emission wavelength, narrow bandwidth and high photoluminescence (PL) efficiency [10][11][12][13][14][15]. Besides, QDs have negligible scattering due to their ultra small sizes (<10 nm).…”

Section: Introductionmentioning

confidence: 99%

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

Li¹,

Zang²,

Chen³

et al. 2016

Opt. Express

160

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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.

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Section: Introductionmentioning

confidence: 99%

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

Li¹,

Zang²,

Chen³

et al. 2016

Opt. Express

160

View full text Add to dashboard Cite

show abstract

“…The absorption coefficient data are used to evaluate the band energy width (E g ) using the relation [3]:…”

Section: Resultsmentioning

confidence: 99%

“…They can be crystallized in hexagonal, cubic or mixed (hexagonalcubic) forms. These films have potential applications in many semiconductor devices such as thin film transistors [1], light emitting diodes [2,3], gas sensors [4] and solar cells [5,6], etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Optical Characterization of CdSe Thin Films Grown by Chemical Bath Deposition

2015

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Cadmium selenide thin films with different pH values (pH = 10, 11, 12 and 13) are produced on glass substrates at 50• C for 3 h by chemical bath deposition technique. The structural, morphological and optical properties of the films are characterized by X-ray diffraction, scanning electron microscopy and optical absorption spectroscopy, respectively. The obtained films have hexagonal structure. The optical transparency of the films varies between 85% and 98% at wavelength of λ = 550 nm. The scanning electron microscopy studies show that the film deposited at pH = 10 exhibits the formation of nanorods in the width range from 1.8 µm to 10.9 µm and length range from 20.0 µm to 85.5 µm. The optical properties of the films are determined by measuring transmittance and absorbance characteristics which are used to find the optical band gap energy, refractive index, extinction coefficient and real dielectric constant. The band gap width of the films increases from 1.70 eV to 2.30 eV with increasing pH values. The refractive index of the film at pH = 10 is found as 1.54.

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“…Throughout all the processing steps, there are many critical aspects that need to be further optimized in order to increase the light emission performances. They include: the surface chemistry properties at the interface between the QDs and polymeric matrix to avoid agglomeration and reduction of QD emission efficiency [ 122 , 123 ], the right mixture of different QDs components to achieve high-color rendering ability [ 124 , 125 , 126 ] and the encapsulation matrix able to protect the chip and to prolong its lifetime [ 127 , 128 ]. For an overview on the main strategies reported in literature, in particular for highly efficient white-light LED, refer to the recent review written by Xie and colleagues [ 129 ].…”

Section: Use Of Qds For Light Emission Applicationsmentioning

confidence: 99%

Engineering of Semiconductor Nanocrystals for Light Emitting Applications

et al. 2016

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Semiconductor nanocrystals are rapidly spreading into the display and lighting markets. Compared with liquid crystal and organic LED displays, nanocrystalline quantum dots (QDs) provide highly saturated colors, wide color gamut, resolution, rapid response time, optical efficiency, durability and low cost. This remarkable progress has been made possible by the rapid advances in the synthesis of colloidal QDs and by the progress in understanding the intriguing new physics exhibited by these nanoparticles. In this review, we provide support to the idea that suitably engineered core/graded-shell QDs exhibit exceptionally favorable optical properties, photoluminescence and optical gain, while keeping the synthesis facile and producing QDs well suited for light emitting applications. Solid-state laser emitters can greatly profit from QDs as efficient gain materials. Progress towards fabricating low threshold, solution processed DFB lasers that are optically pumped using one- and two-photon absorption is reviewed. In the field of display technologies, the exploitation of the exceptional photoluminescence properties of QDs for LCD backlighting has already advanced to commercial levels. The next big challenge is to develop the electroluminescence properties of QD to a similar state. We present an overview of QLED devices and of the great perspectives for next generation display and lighting technologies.

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Formulating CdSe quantum dots for white light-emitting diodes with high color rendering index

Cited by 27 publications

References 42 publications

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

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

Fabrication and Optical Characterization of CdSe Thin Films Grown by Chemical Bath Deposition

Engineering of Semiconductor Nanocrystals for Light Emitting Applications

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