OLED for human centric lighting

Xia, Yiren; Wan, O. Yin; Cheah, Kok Wai

doi:10.1364/ome.6.001905

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…5 , current density decrease with increasing the DCJTB dopant concentration. This result shows the charge transport in a host-dopant system is dependent on not only a host molecule but also a dopant molecule 12 , 32 . Therefore, we neglected the effect of dopant since the concentration rate of DCJTB is less than 1% weight in hosts.…”

Section: Resultsmentioning

confidence: 85%

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Quantitative Analysis of Charge Distribution in Bi-Emissive layer White Organic Light-Emitting Diodes with Two Fluorescent Dopants

Kim

Cheah

2018

Sci Rep

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This work seeks to establish a quantitative method which can estimate the holes and electrons ratio in the emission zones. We fabricated multilayered white organic light-emitting diodes (WOLEDs) with the device structure of ITO/NPB(80 nm)/MADN:BUBD-1(7%)(20 nm)/MADN:DCJTB(0.3%)(20 nm)/TPBi(X nm)/LiF(2 nm)/Al as a case study on the charge recombination distribution in the emissive layer. The result shows a trend in the charge recombination ratio depending on the electron transport layer thickness. We obtained an empirical relationship between electron transport layer thicknesses and emission ratio in EML. In addition, the electroluminescent spectra were analyzed by fitting a Gaussian distribution for the two emissive layers to calculate the intensity ratio of the energy transitions. The arrival time of hole and electrons from each electrode was determined using the thickness and mobility of TPBi as electron transport layer. From these initial results, we derived an empirical mechanism to meet with a linear relationship that can allow us to design custom- made WOLEDs.

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Section: Resultsmentioning

confidence: 85%

“…However, based on this research, this empirical equation can only be demonstrated with identical structures with same materials as this paper due to differences of charge carrier mobility and inappropriate energy barriers. There are a few previous studies which related on this topic utilizing several different methods 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Charge Distribution in Bi-Emissive layer White Organic Light-Emitting Diodes with Two Fluorescent Dopants

Kim

Cheah

2018

Sci Rep

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“…By considering this fact, the Commission Internationale de lʼEclairage (CIE) set some criteria, such as ( x, y ) must be (0.33, 0.33) for white color resolution. 7 As these coordinates are important to achieve for a desired color for display applications, they have been therefore added to most of the research interests in OLEDs. As a reason, we can say that blue emitters have strongly affected the foundation of OLEDs in recent years.…”

Section: Oled Developmentmentioning

confidence: 99%

A Review on the Milestones of Blue Light-Emitting Materials in India

et al. 2023

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Since 1987 in the field of optoelectronics, organic light-emitting diodes (OLEDs) have secured their position because of their extreme use in panels of lighting applications such as TV and smartphone displays. At present, OLEDs are at top-notch position in the lighting market for their promising features. The field of OLEDs is rapidly growing day by day in academia and industry due to the success of OLEDs in the form of excellent efficiency, feasible methods, excellent lifetime, color purity, and superb device architecture. As a result, OLEDs are new profitable leading devices of the 21st century. However, the OLED industry has evolved in optoelectronics in the last 30 years and is advancing rapidly just because of the development in OLED materials (fluorescent, phosphorescent, thermally activated delayed fluorescent, and blue light-emitting materials). Blue light-emitting materials have achieved incredible popularity nationally and internationally. At the international level, USA, Japan, Korea, and Germany are at the top of the list in the production of OLEDs. India has also seen rapid progress in OLED development in the last 12 years and details of research in blue OLEDs by key players of India are involved in this report.1 Introduction1.1 OLED Construction1.2 Working of OLED2 OLED Development2.1 Historical Background of OLED2.1.1 International Status2.1.2 National Status3 Progress of Blue Emitters in India4 Present Scenario of Blue OLEDs5 Conclusions and Outlook

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“…OLED is a solid-state device composed of thin films of organic materials that emit light through the application of a potential. It is an emerging technology for both lighting and flat panel displays, with distinctive advantages such as ultrathin thickness, low power consumption, the ability to emit light without external backlighting, and a wide viewing angle. − The emission of light can be achieved in a single photoactive layer by mixing small molecules and/or organometallic materials that achieve high efficiency and luminance. − An attempt to develop a simple OLED emitter yields interesting results, but it has some issues related to efficiency, reproducibility, and color change with drive current. Recently, thermally activated delayed fluorescence (TADF) materials were used to fabricate high-performance OLEDs because they can harvest both singlet and triplet excitons to target 100% internal quantum efficiency (IQE) .…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed OLEDs Based on a Bipolar AIE Terpyridine Derivative as a Host

Palanisamy,

Rabiei,

Hosseinnezhad

et al. 2024

ACS Appl. Opt. Mater.

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The efficiency of organic light-emitting diodes (OLEDs) with multiple functional components is still limited owing to their complicated design and fabrication process. A postfunctionalization strategy was exploited to develop devices derived from terpyridine derivative bipolar host 4′-(3′,4′,5′-triphenyl-[1,1′:2′,1″-terphenyl]-4-yl)-2,2′:6′,2″-terpyridine to overcome this limitation. The glass transition temperature was up to 176 °C, and the host was favorable for practical OLED devices. The crystallite size of the powder calculated by the modified Scherrer's method was 102 nm. Furthermore, the ionization potential (IP PE ) of the spin-coated host on the fluorine tin oxide (FTO), which is related to the highest occupied molecular orbital (HOMO), was calculated to be 5.98 eV. Both hole and electron mobilities measured by space charge limit current (SCLC) reveal bipolar transport in the host, with a hole mobility of 1.87 × 10 −4 cm 2 V −1 s −1 and an electron mobility of 6.69 × 10 −5 cm 2 V −1 s −1 . Aggregation-induced emission (AIE) phenomena were discussed in detail with field emission scanning electron microscopy (FESEM). In addition, a thermally activated delayed fluorescence (TADF) emitter consisting of 10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (DMAC-TRZ) was considered in a host−guest system. Taking into account the role of the designed and synthesized host, using poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) as a hole injection layer (HIL) for cyan OLED solution processing, the maximum luminescence, current, power, and external quantum efficiency (EQE) reached 19,986 cd m −2 , 45.15 cd A −1 , 32.95 lm W −1 , and 22.35%, respectively, for host (70 wt %):DMAC-TRZ as an emitting layer.

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OLED for human centric lighting

Cited by 12 publications

References 20 publications

Quantitative Analysis of Charge Distribution in Bi-Emissive layer White Organic Light-Emitting Diodes with Two Fluorescent Dopants

Quantitative Analysis of Charge Distribution in Bi-Emissive layer White Organic Light-Emitting Diodes with Two Fluorescent Dopants

A Review on the Milestones of Blue Light-Emitting Materials in India

Solution-Processed OLEDs Based on a Bipolar AIE Terpyridine Derivative as a Host

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