High efficiency luminescence from PbS quantum dots embedded glasses for near-infrared light emitting diodes

Yin, Qiaoyun; Zhang, Wenchao; Zhou, Yao; Wang, Ru-Zhi; Zhao, Zhiyong; Liu, Chao

doi:10.1016/j.jlumin.2022.119065

Cited by 18 publications

(8 citation statements)

References 52 publications

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“…In [26], for PbS QDs with an average size of about 2 nm and exciton absorption peak at 560 nm (2.21 eV), the Stokes shift of 0.39 eV was demonstrated. It is noticeably smaller than the similar value in [1,25].…”

Section: Introductioncontrasting

confidence: 57%

“…A negative Stokes shift was also found in [1] for a series of PbS QDs in glass with an exciton absorption peak at 1851, 2004, and 2043 nm, which, according to authors view, corresponds to the QDs with an average size of 8.3, 9.2, and 9.5 nm, respectively. For the smallest PbS QDs with size of 3.6-3.7 nm the Stokes shift reaches 0.45-0.50 eV [1].…”

Section: Introductionmentioning

confidence: 64%

“…These properties introduce the great promise for applications in various photonics devices, such as the electroluminescent and laser emitters; luminescent sensors; luminescent indicators of the temperature, pH value; control systems of the intensity, radiation phase, etc. [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Increased attention to this material is due to the possibility to use it in the infrared range, since the band gap is 0.41 eV [24]. Decreasing the crystals size to 1-20 nm due to the quantum size effect, makes it possible to tune the absorption and luminescence bands from the IR to visible region [1,[25][26][27][28][29][30][31]. However, at the present time there is no unified point of view regarding the criteria for establishing the QDs luminescence mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Size effect in PbS Quantum Dots Luminescence

Grevtseva

Chevychelova

Ovchinnikov

et al. 2022

Preprint

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This paper presents new regularities of the size effect in IR luminescence of semiconductor colloidal PbS quantum dots, passivated with thioglycolic acid molecules (PbS/TGA QDs). It was found that decrease in the average PbS/TGA QDs size of the sample from 4.9 nm to 2.6 nm produces the luminescence peak shifts from 1350 nm to 865 nm. At that time, in the excitation spectrum the peak due to exciton absorption shifts from 1235 nm to 707 nm. The Stokes shift increases from 0.086 to 0.32 eV. The study of time-resolved luminescence showed that the luminescence decay is complex non-exponential it, that is determined by the statistical distribution of luminescence quenchers in PbS/TGA QDs over the ensemble. The complex of the obtained experimental results made it possible to conclude that the observed luminescence is determined by the radiative annihilation of exciton in PbS/TGA QDs.

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Section: Introductioncontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Size effect in PbS Quantum Dots Luminescence

Grevtseva

Chevychelova

Ovchinnikov

et al. 2022

Preprint

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“…In the past decades, most research in QLEDs has focused on improving the EQE, brightness, and display color gamut. [66,[170][171][172][173][174][175][176] With the advent of foldable phones and wearable watches, expectations have been raised for display devices that can achieve higher degrees of freedom of deformation. QLEDs, characterized by ultrathin multilayer functional structure and solution-processing fabrication, are highly compatible with flexible and stretchable applications.…”

Section: Flexible and Stretchable Strategiesmentioning

confidence: 99%

Flexible Quantum Dot Light‐Emitting Device for Emerging Multifunctional and Smart Applications

et al. 2023

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Quantum dot light‐emitting diodes (QLEDs), owing to their exceptional performances in device efficiency, color purity/tunability in the visible region and solution‐processing ability on various substrates, become a potential candidate for flexible and ultrathin electroluminescent (EL) lighting and display. Moreover, beyond the lighting and display, flexible QLEDs are enabled with endless possibilities in the era of the internet of things and artificial intelligence by acting as input/output ports in wearable integrated systems. Challenges remain in the development of flexible QLEDs with the goals for high performance, excellent flexibility/even stretchability, and emerging applications. In this paper, the recent developments of QLEDs including quantum dot materials, working mechanism, flexible/stretchable strategies and patterning strategies, and highlight its emerging multifunctional integrations and smart applications covering wearable optical medical devices, pressure‐sensing EL devices, and neural smart EL devices, are reviewed. The remaining challenges are also summarized and an outlook on the future development of flexible QLEDs made. The review is expected to offer a systematic understanding and valuable inspiration for flexible QLEDs to simultaneously satisfy optoelectronic and flexible properties for emerging applications.

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Colloidal Quantum Dot‐Based Near and Shortwave Infrared Light Emitters: Recent Developments and Application Prospects

Kumar,

Pradhan

2024

Advanced Optical Materials

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Solution‐processed quantum dot‐based near and short‐wave infrared light emitters have witnessed substantial developments in recent years. A variety of colloidal quantum dots (CQDs)‐based light emitters, including light‐emitting diodes, optical down‐converters, and emitters showing amplified spontaneous emission, lasing in the near and short‐wave infrared region, are demonstrated over the years. The progress in chemical synthesis of CQDs, development of novel CQDs, better understanding of the surface properties, chemical treatments to improve the optoelectronic properties, and suitable device engineering led to tremendous advances in the light emission performance in the near and short‐wave infrared region. A broad investigation is done into various CQD materials to achieve efficient near‐infrared light emitters. This review gives a detailed account of the advancement of the CQD‐based near and short‐wave infrared light emitters, strategies to improve the optoelectronic performance, controlling optical properties, demonstrated applications, the challenges that need to be tackled for further development, and future research direction.

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High efficiency luminescence from PbS quantum dots embedded glasses for near-infrared light emitting diodes

Cited by 18 publications

References 52 publications

Size effect in PbS Quantum Dots Luminescence

Size effect in PbS Quantum Dots Luminescence

Flexible Quantum Dot Light‐Emitting Device for Emerging Multifunctional and Smart Applications

Colloidal Quantum Dot‐Based Near and Shortwave Infrared Light Emitters: Recent Developments and Application Prospects

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