A high quality liquid-type quantum dot white light-emitting diode

Sher, Chin‐Wei; Lin, Chien-Chung; Lin, Hsiao‐Yi; Lin, Chun‐Yuan; Huang, Che-Hsuan; Chen, Kuo-Ju; Li, Jie-Ru; Wang, Kuanyu; Tu, Hsien-Hao; Fu, Chien-Chung; Kuo, Hao‐Chung

doi:10.1039/c5nr05676d

Cited by 58 publications

(33 citation statements)

References 26 publications

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“…Another on-shelf test was performed by sealing the CQD in the liquid format to preserve their lamination efficiency. A 1000-hour storage time can be demonstrated for high color rendering index and highly efficient CQD LEDs [10]. The art to seal the CQD in the liquid format is still an good topic under investigation.…”

Section: Resultsmentioning

confidence: 99%

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23.4: Invited Paper: The Longevity Study for Hybrid Colloidal Quantum Dot Optoelectronic Devices

Lin

2019

Symp Digest of Tech Papers

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The nano‐scale size of colloidal quantum dots provide unique properties, such as strong luminescent efficiency, wavelength tunable emission, and narrow linewidth etc., which are desirable for high quality display devices. However, the reliability of these nanoparticles is always the center of attention when the commercialization issue is discussed. In this paper, we will review our latest result on the hybrid package method that can dramatically improve the lifetime of these magnificent optoelectronic materials.

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Section: Resultsmentioning

confidence: 99%

“…Another possible solution is to keep CQDs in the liquid format via the package design [10]. The ordinary CQDs can sustain high efficiency in the solvent for a long time.…”

Section: Generic Device Structurementioning

confidence: 99%

23.4: Invited Paper: The Longevity Study for Hybrid Colloidal Quantum Dot Optoelectronic Devices

Lin

2019

Symp Digest of Tech Papers

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“…As a typical example, effective heat dissipation from a white light‐emitting plate by use of a graphene coating helped the WLED to achieve long‐term reliability in emission color characteristics even at high power operating conditions . Packaging of QDs for fabricating WLED color converters can be made in solid and liquid phases . QDs can be more readily dispersed in a liquid, rather than a solid, matrix .…”

Section: Optical Properties Of Cdzns/zns Cdznses/zns and Cdse/cds/zmentioning

confidence: 99%

Highly Luminescent Quantum Dots in Remote‐Type Liquid‐Phase Color Converters for White Light‐Emitting Diodes

Choi

Han

et al. 2018

Adv Materials Technologies

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QDs. [14][15][16][17] However, they have less than optimal optical properties due to nonradiative recombination by defects. [12,18] As a result, despite the safety issues, Cdbased QDs are still attracting much attention and are seen as promising candidate materials for versatile applications in nonbiological environments owing to their outstanding performance with respect to tunable luminescence across the ultraviolet-visible-near-infrared (UV-vis-NIR) region, broad absorption bands with narrow emission bands, high quantum yields, [19] chemical stability, and photostability. [20,21] It is important to note that QDs have been passivated with higher bandgap semiconductor layers, such as ZnS and CdS, to increase the quantum yield. In the core-shell type QDs, the shell provides physical and chemical stabilities, as well as photostability to the core QDs, which is important for minimizing cytotoxicity, and also offers platforms for ligand exchange and further functionalization. [22] White light-emitting diodes (WLEDs) are commonly fabricated by combining inorganic phosphors with a blue or UV LED. [23,24] However, it is not easy to achieve a tailored and fullspectrum white light with currently available phosphors. The light spectra emitted by phosphor-based WLEDs are tuned by adjusting weight ratios of phosphors with different emission wavelengths. QDs behave like phosphors but their emissive colors are controlled by varying the size and composition. QDs have emerged as a good alternative to the phosphors in LEDs. Quantum dots (QDs) can be integrated into a solid-phase color converter (SCC) for white light-emitting diodes (WLEDs). However, the development of QD-based SCCs is prevented by the limitations of the QDs themselves, nonuniform dispersion or aggregation of the QDs, and heat accumulation by low thermal conductivity of the solid matrix. Herein, the development of new high-quality CdZnSeS/ZnS QDs in a one spot synthesis is reported that have high photoluminescence quantum yield (up to 100% for green wavelengths), narrow emission spectra (full width at half maximum< 27.3 nm), and good color tunability in the green region, 496-586 nm. Seven different color QDs are used to fabricate liquid-phase color converters (LCCs) for application in WLEDs with a remote configuration. The best LCC-based WLEDs show not only intense bright day white light (correlated color temperature = 6029 K) with a maximum luminous efficacy of 222.7 lm W −1 , but also excellent color quality (color rendering index = 95.1, as well as R9 = 94.4, and R13 = 97.1), which is very important in medical diagnostic lighting, dressing and display room lighting, painting and accent lighting. These results indicate remarkable progress both in the synthesis of high-quality QDs and in the development of WLEDs for high-performance commercial lighting devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.201800235.Semiconductor nanocrystals, namely quantum dots (QDs) have created many innova...

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“…higher CRI and simpler driving circuit design. [11] However, there are still two major issues. One is the intensity and color regulation of output light.…”

Section: Introductionmentioning

confidence: 99%

P‐9.1: QD based color converter with DBR Structure and its application on Micro‐LED

Weng

Yan²,

Guo³

et al. 2019

Symp Digest of Tech Papers

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An enhancement of light extraction efficiency of quantum dots (QD) in light‐emitting diodes (LEDs) with Bi‐functional TiO2/Al2O3 distributed Bragg reflector (DBR) nanolaminate structure grown by atomic layer deposition (ALD) has been demonstrated. The DBRs were simulated and optimized with TFCalc, and they exhibited excellent and tunable optical properties, as well as reliable moisture barrier performance. These DBRs were integrated in the QD‐LED, enabling an obvious increase in red emission and a strong decrease in blue light transmittance, which can achieve color conversion greatly. Furthermore, these DBRs can prolong the lifetime of QDs evidently by isolating the QDs from the moisture vapor. These results highlight the potential application of DBRs in the QLEDs and QD‐LEDs.

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A high quality liquid-type quantum dot white light-emitting diode

Cited by 58 publications

References 26 publications

23.4: Invited Paper: The Longevity Study for Hybrid Colloidal Quantum Dot Optoelectronic Devices

23.4: Invited Paper: The Longevity Study for Hybrid Colloidal Quantum Dot Optoelectronic Devices

Highly Luminescent Quantum Dots in Remote‐Type Liquid‐Phase Color Converters for White Light‐Emitting Diodes

P‐9.1: QD based color converter with DBR Structure and its application on Micro‐LED

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