Enhanced Efficiency of InP-Based Red Quantum Dot Light-Emitting Diodes

Liu, Dong; Kristal, Boris; Wang, Yunjun; Feng, Jingwen; Lu, Zhigao; Yu, Gang; Chen, Zhuo; Li, Yanzhao; Li, Xinguo; Xu, Xiaoguang

doi:10.1021/acsami.9b07437

Cited by 51 publications

(45 citation statements)

References 30 publications

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“…The VBM of the thin shell InP QDs was—6.74 eV, which is much lower than most reported green InP QDs (−5.35 eV). [ 31–34 ] The halogen ligand on QD is the main reason for the very low VBM. A similar rule was also mentioned by other studies of PbSe and CdSe QLED that containing Cl − , in which the strong electron negative ligands lower the valence band of QDs.…”

Section: Resultsmentioning

confidence: 99%

Green InP/ZnSeS/ZnS Core Multi‐Shelled Quantum Dots Synthesized with Aminophosphine for Effective Display Applications

Liu

Lou

Ding

et al. 2021

Adv Funct Materials

102

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InP quantum dots (QDs) are emerging as promising materials for replacing cadmium‐based QDs in view of their heavy metal‐free and tunable luminescence. However, the development of InP QD materials still lags due to the expensive and flammable phosphorus precursors, and also the unsatisfactory repeatability caused by the fast nucleation rate. Adopting lowly reactive P precursor aminophosphine can overcome this issue, but their low photoluminescence quantum yield (PLQY) and widening line widths do not apply to the practical application. Through engineering, the core‐shell structure of QD, significantly promoted green emissions of QDs were obtained with PLQY of 95% and full width and half maximum (FWHM) of 45 nm, which demonstrated the highest PLQY record obtained from the aminophosphine system. Moreover, due to the residue halogen atoms on the QD surface as inorganic ligands to prevent further oxidization, these InP QDs demonstrated the ultra‐long operational lifetime (over 1000 h) for QDs based color enhancement film. By optimizing the device structure, an inverted green InP quantum dot light‐emitting diode (QLED) with external quantum efficiency (EQE) of 7.06% was also demonstrated, which showed a significant promise of these InP QDs in highly effective optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Green InP/ZnSeS/ZnS Core Multi‐Shelled Quantum Dots Synthesized with Aminophosphine for Effective Display Applications

Liu

Lou

Ding

et al. 2021

Adv Funct Materials

102

View full text Add to dashboard Cite

show abstract

“…Quantum dot (QD) is the most promising next-generation elements for LED display due to their cost-effective production, superior color purity, nanosecond response time, high quantum yield and precisely tunable emission wavelength through the whole visible to the near infrared range. [1][2][3] Such unique optical properties make QD more suitable to be used as color conversion (CC) than commercial color filter for back light unit, liquid crystal display and LEDs. [4,5] Compare to the conventional phosphors, QD can realizing a wide color gamut due to the narrow emission line width, and a thin light conversion layer to meet the slim criterion of current TVs.…”

Section: Introductionmentioning

confidence: 99%

P‐4.7: Optical structure design of quantum dot color conversion Pixel and Its Display Applications

Yang

Yue

Qiao

et al. 2021

Symp Digest of Tech Papers

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Quantum dot color conversion as a display form, it can greatly improve the display color gamut of OLED, and can also be used as an effective colorization technology solution for MicroLED. Here we design the quantum dot pixel structure, carry out the preparation and verification of big‐thickness BM, quantum dot pixel and Bragg reflector for prepare quantum dot color conversion devices initially. After evaluation, we give corresponding suggestions for the application research of later quantum dot color conversion.

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“…Because InP QDs do not contain heavy metal elements, they show stable quantum yield and size-tunable photoluminescence (PL) emission from visible to nearinfrared (NIR) range, and InP QDs are beneficiary in biological applications. 14,15 For example, Zhang et al carried out in vivo imaging of tumor-bearing nude mice with silica medium composite probe encapsulated InP/ZnS QDs and found that the composite probe had excellent tumor targeting and fluorescence imaging capabilities. 16 More importantly, different from the ionic bond in CdSe QDs, the covalent bond in InP QDs is stronger and more robust, which makes them less toxicity.…”

Section: Introductionmentioning

confidence: 99%

<p>In vivo Comparison of the Biodistribution and Toxicity of InP/ZnS Quantum Dots with Different Surface Modifications</p>

Chen

et al. 2020

IJN

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Introduction: Indium phosphide (InP) quantum dots (QDs) have shown a broad application prospect in the fields of biophotonics and nanomedicine. However, the potential toxicity of InP QDs has not been systematically evaluated. In particular, the effects of different surface modifications on the biodistribution and toxicity of InP QDs are still unknown, which hinders their further developments. The present study aims to investigate the biodistribution and in vivo toxicity of InP/ZnS QDs. Methods: Three kinds of InP/ZnS QDs with different surface modifications, hQDs (QDs-OH), aQDs (QDs-NH 2), and cQDs (QDs-COOH) were intravenously injected into BALB/c mice at the dosage of 2.5 mg/kg BW or 25 mg/kg BW, respectively. Biodistribution of three QDs was determined through cryosection fluorescence microscopy and ICP-MS analysis. The subsequent effects of InP/ZnS QDs on histopathology, hematology and blood biochemistry were evaluated at 1, 3, 7, 14 and 28 days post-injection. Results: These types of InP/ZnS QDs were rapidly distributed in the major organs of mice, mainly in the liver and spleen, and lasted for 28 days. No abnormal behavior, weight change or organ index were observed during the whole observation period, except that 2 mice died on Day 1 after 25 mg/kg BW hQDs treatment. The results of H&E staining showed that no obvious histopathological abnormalities were observed in the main organs (including heart, liver, spleen, lung, kidney, and brain) of all mice injected with different surfacefunctionalized QDs. Low concentration exposure of three QDs hardly caused obvious toxicity, while high concentration exposure of the three QDs could cause some changes in hematological parameters or biochemical parameters related to liver function or cardiac function. More attention needs to be paid on cQDs as high-dose exposure of cQDs induced death, acute inflammatory reaction and slight changes in liver function in mice. Conclusion: The surface modification and exposure dose can influence the biological behavior and in vivo toxicity of QDs. The surface chemistry should be fully considered in the design of InP-based QDs for their biomedical applications.

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Enhanced Efficiency of InP-Based Red Quantum Dot Light-Emitting Diodes

Cited by 51 publications

References 30 publications

Green InP/ZnSeS/ZnS Core Multi‐Shelled Quantum Dots Synthesized with Aminophosphine for Effective Display Applications

Green InP/ZnSeS/ZnS Core Multi‐Shelled Quantum Dots Synthesized with Aminophosphine for Effective Display Applications

P‐4.7: Optical structure design of quantum dot color conversion Pixel and Its Display Applications

<p>In vivo Comparison of the Biodistribution and Toxicity of InP/ZnS Quantum Dots with Different Surface Modifications</p>

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