Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes

Wang, Hung Chia; Bao, Zhen; Tsai, Hsin Yu; Tang, An; Liu, Ru‐Shi

doi:10.1002/smll.201702433

Cited by 266 publications

(180 citation statements)

References 142 publications

(273 reference statements)

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“…Electroluminescent (EL) devices have been the research hotspots for decades because of their enormous market value in lighting sources and displays . In particular, tremendous efforts have been put into developing the cost‐effective fabrication approaches for eco‐friendly illumination units, such as organic light‐emitting diodes (OLEDs) and quantum dots based light‐emitting diodes (QLEDs) . OLEDs and QLEDs give rise to light emission when injected charges recombine radiatively at the active emissive layer driven by constant‐voltage or direct current (DC).…”

Section: Introductionmentioning

confidence: 99%

Advances in Alternating Current Electroluminescent Devices

Wang

Lian

et al. 2019

Advanced Optical Materials

111

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radiatively at the active emissive layer driven by constant-voltage or direct current (DC). However, the DC-driven mode for OLEDs and QLEDs limits their practical applications. One reason is that the unidirectional DC flow may lead to unfavorable charges accumulation at high current density. Furthermore, the power losses are unavoidable as the DC-driven devices require power converters and rectifiers when connected to the 110/220 V at 50/60 Hz alternating current (AC) power sources. OLEDs are also particularly sensitive to dimensional variations accompanied by the generation of leakage currents at such imperfections, which is unfavorable for their application in flexible electronics. Consequently, AC-driven EL devices have attracted attention as promising alternatives to DC-driven EL devices for a variety of applications. [25][26][27][28][29][30][31][32][33] AC-driven EL devices are primarily composed of electrodes, an emissive layer and a single-or multilayer of insulating dielectric without the critical requirement for energy band matching, which facilitates their application in large-scale displays and flexible devices. [34] The device structure of AC-driven EL devices can be mainly divided into three kinds: i) AC-driven thin film electroluminescent (AC-TFEL) devices; ii) AC-driven lightemitting devices (AC-LEDs), and iii) AC-driven light-emitting field effect diodes (AC-LEFETs). Under the AC electric field, light generation is based on either the hot-electron impact excitation mechanism or the exciton recombination mechanism, depending on the device configuration. Despite the different operation principles, AC-driven EL devices have shown specific Alternating current (AC)-driven electroluminescent (EL) devices have recently attracted attention as potential alternatives to direct current (DC)-driven organic light-emitting diodes (OLEDs), as they have the great advantage of easy integration into the AC power system of 110/220 V at 50/60 Hz without complicated back-end electronics. However, the high driving voltage and low power efficiency inherent to AC-driven EL devices limit their widespread application. While researchers have made some remarkable progress in this field, the underlying causes during the development process remain to be explored. The strategies for improving the performance of AC-driven EL devices with different configurations, such as the conventional sandwiched structure and multilayer-based light-emitting devices, are summarized in this review. For example, it is crucial to enhance the effective electric field around the emitters for AC-driven thin film electroluminescent (AC-TFEL) devices, while the unbalanced generation/injection of charge carriers is the main limiting factor for the performance of AC-driven light-emitting devices (AC-LEDs). The recent advances in AC-driven EL devices, with some new configurations or new-type emitting materials, are presented by category. The challenges and opportunities for the further development of AC-driven EL devices are also discussed.

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Section: Introductionmentioning

confidence: 99%

Advances in Alternating Current Electroluminescent Devices

Wang

Lian

et al. 2019

Advanced Optical Materials

111

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“…The W-LED device thus packaged reveals high circadian with a tunable range and high color purity. The improved device shows a luminous efficiency (LE) of 58.8 lm w −1 , a CRI value of 95, CFI with Rf = 91.4, and CGI with Rg = 102 and a CCT value of 6459 K. Circadian luminescence is established on the day-night rhythmic change of natural-light environments [36].…”

Section: Quantum Dotsmentioning

confidence: 99%

Luminescent Materials in Lighting, Display, Solar Cell, Sensing, and Biomedical Applications

Soni¹,

Singh²

2020

Luminescence - OLED Technology and Applications

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This chapter comprises a broader extent of the luminescence phenomenon with the mechanism involved therein as well as applications. Typically, the up and down conversion and downshifting behavior of the optical materials have been elucidated in brief. The fundamental understanding of these optical materials has been described by using schematic representations. It is well documented that the rare earth-based optical materials are known for their luminescent enrichment due to availability of the ladder-like energy levels. These energy levels can be utilized for the excitation of the luminescent materials by using a suitable excitation source. In the process of development of luminescent materials, choice of host matrices and dopant ions is very crucial. Strong correlation of these optical materials has been shown with the current scenario of our society and daily life. In view of the ongoing research, nanophosphor, glasses, and quantum dots with size-and shape-dependent optical behavior have been given in detail. The involved mechanism and the energy transfer phenomenon have been well elucidated by schematic and figures for the evident explanation to the readers. Our emphasis is to elucidate these optical materials in the development of innovative multifunctional applications such as lighting, display, sensing, LEDs, solar cell, and biological applications.

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“…Especially, colloidal perovskite crystals with a size range of a few nanometers or nanocrystals (NCs) have attracted the attention of many scientists because of the quantum‐confined behavior and their unique optical diversity. Several review papers and perspective articles discussing the synthesis and the optical and electronic properties for the integration of perovskite nanocrystals into optoelectronic applications such as photovoltaic applications (solar cells) or light‐emitting devices (LEDs) have been published in the last years …”

Section: Introductionmentioning

confidence: 99%

“…Several review papers and perspective articles discussing the synthesis and the optical and electronic properties for the integration of perovskite nanocrystals into optoelectronic applications such as photovoltaic applications (solar cells) or light-emitting devices (LEDs) have been published in the last years. [11][12][13][14][15][16][17][18][19][20][21][22] 2 | STRUCTURE, SYNTHESIS, AND REC. 2020…”

Section: Introductionmentioning

confidence: 99%

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

et al. 2019

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Perovskite quantum dots (QDs) are emerging as one of the most promising candidates for the monochromatic light‐emitting diodes (LEDs) approaching the Rec. 2020 color gamut due to their extremely narrow emission bandwidth. Another important aspect are the high photoluminescence quantum yield (PLQY) values that can be obtained either in solution or thin films making these materials as promising candidates for optoelectronic applications such as LEDs or solar cells. Considerable research efforts in chemistry, chemical engineering, solid‐state physics, and material sciences have been made in the past years. The new opportunity in the field of semiconductor quantum dots is still in the beginning phase and is expected to remain active in the following years. Here, in this invited commentary, we briefly discuss and summarize the opportunities and challenges in both fundamental and technological aspects, based on our work and the recent work in this field.

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Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes

Cited by 266 publications

References 142 publications

Advances in Alternating Current Electroluminescent Devices

Advances in Alternating Current Electroluminescent Devices

Luminescent Materials in Lighting, Display, Solar Cell, Sensing, and Biomedical Applications

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

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