Recent Developments in Applications of Quantum-Dot Based Light-Emitting Diodes

Armăşelu, Anca

doi:10.5772/intechopen.69177

Cited by 10 publications

(4 citation statements)

References 50 publications

(70 reference statements)

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“…[124] a comprehensive review is furnished about the appropriately engineered core/graded-shell QDs revealing advantageous optical properties and unique photoluminescence assets of QDs for liquid crystal displays backlighting technologies and organic light-emitting diode tools. In different papers which have to do with the quantum dot-based-light-emitting diodes (QD-LEDs) results [124][125][126][127], it is mentioned that for the improvement of the QD-LED performance, two processes must be diminished: trapping of carriers at surface defects and Auger recombination of excitons.…”

Section: Excitons and Biexcitons In Zero-dimensional Semiconductor Stmentioning

confidence: 99%

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

Armăşelu¹

2020

Advances in Condensed-Matter and Materials Physics - Rudimentary Research to Topical Technology

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Knowing excitonic and biexcitonic properties of low-dimensional semiconductors systems is extremely important for the discovery of new physical effects and for the development of novel optoelectronics applications. This review work furnishes an interdisciplinary analysis of the fundamental features of excitons and biexcitons in two-dimensional semiconductor structures, one-dimensional semiconductor structures, and zero-dimensional (0D) semiconductor structures. There is a focus on spectral and dynamical properties of excitons and biexcitons in quantum dots (QDs). A study of the recent advances in the field is given, emphasizing the latest theoretical results and latest experimental methods for probing exciton and biexciton dynamics. This review presents an outlook on future applications of engineered multiexcitonic states including the photovoltaics, lasing, and the utilization of QDs in quantum technologies.

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Section: Excitons and Biexcitons In Zero-dimensional Semiconductor Stmentioning

confidence: 99%

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

Armăşelu¹

2020

Advances in Condensed-Matter and Materials Physics - Rudimentary Research to Topical Technology

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“…It is considered a strong competitor of a new generation of high‐performance display and lighting technology due to its huge potential in flexible wearables, low power consumption, and high color purity. [ 24,29–38 ]…”

Section: Introductionmentioning

confidence: 99%

“…It is considered a strong competitor of a new generation of highperformance display and lighting technology due to its huge potential in flexible wearables, low power consumption, and high color purity. [24,[29][30][31][32][33][34][35][36][37][38] In recent decades, due to a number of studies focusing on optimizing QDs materials and device structures, the performance of QLEDs has been significantly improved. The maximum external quantum efficiency (EQE) of the three primary colors (red, green, and blue) QLEDs has exceeded 20%.…”

mentioning

confidence: 99%

A Review on Quantum Dot Light‐Emitting Diodes: From Materials to Applications

Tian

Huang

et al. 2022

Advanced Optical Materials

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more attractive than backlight applications in terms of color accuracy, response time, and color gamut. It is considered a strong competitor of a new generation of highperformance display and lighting technology due to its huge potential in flexible wearables, low power consumption, and high color purity. [24,[29][30][31][32][33][34][35][36][37][38] In recent decades, due to a number of studies focusing on optimizing QDs materials and device structures, the performance of QLEDs has been significantly improved. The maximum external quantum efficiency (EQE) of the three primary colors (red, green, and blue) QLEDs has exceeded 20%. The T 50 operating lifetimes (the time for the brightness to decrease to 50% of the initial brightness) of the three primary colors QLEDs at an initial brightness of 100 cd m −2 reached 125 000 000, 2 570 000, and 24 000 h, respectively. [39,40] Constantly refreshed performance shows promising prospects, but poor device stability still hinders the commercialization of QLEDs.This review focuses on the development of materials and device physics for QLEDs. First, the unique optical advantages of QDs for display are presented in Section 2, and then the development history of the device structure is reviewed in Section 3. The two essential nodes in the commercialization process of QLEDs are efficiency and stability. Therefore, we discussed the carrier dynamics that have a decisive influence on the device efficiency in Section 4, including subthreshold turn-on which can reflect carrier injection and recombination behavior, charge transport modification, exciton generation process, and effect of charged QD on carrier dynamics. In Section 5, we emphasized the stability of the device, including operating stability, shelf stability, and efficiency roll-off. Finally, we presented the key issues and challenges, aiming to play a positive role in promoting the commercial application of QLEDs.

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“…QDs are widely applicable in a variety of fields due to their highly tunable properties. They could potentially be used in electronic technologies and display technology, for example, in solar cells, photodetectors, photodiodes, field-effect transistors, biological systems, flat-panel TV displays, digital cameras, mobile phones, and gaming equipment [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot-Based White Organic Light-Emitting Diodes Excited by a Blue OLED

et al. 2022

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In this study, white organic light-emitting diodes (OLEDs) consisting of red quantum dots (RQD) and green quantum dots (GQD) were investigated. These are the most exciting new lighting technologies that have grown rapidly in recent years. The white OLED development processes used consisted of the following methods: (a) fabrication of a blue single-emitting layer OLED, (b) nanoimprinting into QD photoresists, and (c) green and red QD photoresists as color conversion layers (CCL) excited by blue OLEDs. To fabricate the blue OLED, the HATCN/TAPC pair was selected for the hole injection/transport layer on ITO and TPBi for the electron transport layer. For blue-emitting material, we used a novel polycyclic framework of thermally activated delayed fluorescence (TADF) material, ν-DABNA, which does not utilize any heavy metals and has a sharp and narrow (FWHM 28 nm) electroluminescence spectrum. The device structure was ITO/HATCN (20 nm)/TAPC (30 nm)/MADN: ν-DABNA (40 nm)/TPBi (30 nm)/LiF (0.8 nm)/Al (150 nm) with an emitting area of 1 cm × 1 cm. The current density, luminance, and efficiency of blue OLEDs at 8 V are 87.68 mA/cm2, 963.9 cd/m2, and 1.10 cd/A, respectively. Next, the bottom emission side of the blue OLED was attached to nanoimprinted RQD and GQD photoresists, which were excited by the blue OLED in order to generate an orange and a green color, respectively, and combined with blue light to achieve a nearly white light. In this study, two different excitation architectures were tested: BOLED➔GQD➔RQD and BOLED➔RQD➔GQD. The EL spectra showed that the BOLED➔GQD➔RQD architecture had stronger green emissions than BOLED➔RQD➔GQD because the blue OLED excited the GQD PR first then RQD PR. Due to the energy gap architectures in BOLED-GQD-RQD, the green QD absorbed part of the blue light emitted from the BOLED, and the remaining blue light penetrated the GQD to reach the RQD. These excited spectra were very close to the white light, which resulted in three peaks emitting at 460, 530, and 620 nm. The original blue CIE coordinates were (0.15, 0.07). After the excitation combination, the CIE coordinates were (0.42, 0.33), which was close to the white light position.

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Recent Developments in Applications of Quantum-Dot Based Light-Emitting Diodes

Cited by 10 publications

References 50 publications

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

A Review on Quantum Dot Light‐Emitting Diodes: From Materials to Applications

Quantum Dot-Based White Organic Light-Emitting Diodes Excited by a Blue OLED

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