High-performance OLEDs and their application to lighting

Ide, Nobuhiro; Tsuji, Hiroya; Ito, Norihiro; Sasaki, Hiroyuki; Nishimori, Taisuke; Kuzuoka, Yoshikazu; Fujihara, Koki; Miyai, Takao; Komoda, Tsugikazu

doi:10.1117/12.798190

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The vision of solid state lighting has largely been driven firstly by the desire to reduce energy consumption and secondly to get pollution free light generation. Today, OLEDs are promising for their applications as solid state lighting devices [169][170][171][172][173][174][175][176][177][178][179][180][181]. The incandescent light bulbs and fluorescent tubes have several drawbacks; therefore, in recent years the researchers are making great efforts to replace them by solid state lighting (SSL) devices.…”

Section: Applications Of Oleds In Displaysmentioning

confidence: 99%

Organic Light - Emitting Diodes and their Applications

Chandra¹,

Chandra

Jha

2014

DDF

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Organic light emitting diodes (OLEDs) have been the focus of intense study since the late 1980s, when the low voltage organic electroluminescence in small organic molecules such as Alq3, and large organic molecules such as polymers (PPV), was reported. Since that time, research has continued to demonstrate the potential of OLEDs as viable systems for displays and eco-friendly lighting applications. OLEDs offer full colour display, reduced manufacturing cost, larger viewing angle, more flexible, lower power consumption, better contrast, slimmer, etc. which help in replacing the other technologies such as LCD. The operation of OLEDs involves injection of charge carriers into organic semiconducting layers, recombination of charge carriers, formation of singlet and triplet excitons, and emission of light during decay of excitons. The maximum internal quantum efficiency of fluorescent OLEDs consisting of the emissive layer of fluorescent organic material is 25% because in this case only the 25% singlet excitons can emit light. The maximum internal quantum efficiency of phosphorescent OLEDs consisting of the emissive layer of fluorescent organic material mixed with phosphorescent material of heavy metal complexes such as platinum complexes, iridium complexes, etc. is nearly 100% because in this case both the 25% singlet excitons and 75% triplet excitons emit light. Recently, a new class of OLEDs based on thermally activated delayed fluorescence (TADF) has been reported, in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates of more than 106decays per second. These molecules harness both singlet and triplet excitons for light emission through fluorescence decay channels and provides an intrinsic fluorescence efficiency in excess of 90 per cent and a very high external electroluminescence efficiency of more than 19 per cent, which is comparable to that achieved in high-efficiency phosphorescence-based OLEDs.The OLED technology can be used to make screens large enough for laptop, cell phones, desktop computers, televisions, etc. OLED materials could someday be applied to plastic and other materials to create wall-size video panels, roll-up screens for laptops, automotive displays, and even head wearable displays. Presently, the OLEDs are opening up completely new design possibilities for lighting in the world of tomorrow whereby the offices and living rooms could be illuminated by lighting panels on the ceiling. The present paper describes the salient features of OLEDs and discusses the applications of OLEDs in displays and solid state lighting devices. Finally, the challenges in the field of OLEDs are explored. Contents of Paper

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Section: Applications Of Oleds In Displaysmentioning

confidence: 99%

Organic Light - Emitting Diodes and their Applications

Chandra¹,

Chandra

Jha

2014

DDF

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“…In today's state-of-the-art of semiconductor technologies, organic semiconductors have both demonstrated their ability to achieve technological applications at the consumer-electronic market-level [1,2], and continues to inspire the scientific community by unlocking truly disruptive abilities to realize next-generation electronics [3][4][5]. For their potentials for lowcost electronics [6], soft processing, and device added features such as flexibility or transparency [7], these materials have been widely investigated in a range of microelectronic and optoelectronic architectures such as field-effect transistors [8], light-emitting PN-diodes (OLEDs) [9], Schottky diodes [10] and single carrier sensing devices [11].…”

Section: Introductionmentioning

confidence: 99%

Concentration-control in all-solution processed semiconducting polymer doping and high conductivity performances

et al. 2020

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Simultaneously optimizing performances, processability and fabrication cost of organic electronic materials is the continual source of compromise hindering the development of disruptive applications. In this work, we identified a strategy to achieve record conductivity values of one of the most benchmarked semiconducting polymers by doping with an entirely solution-processed, water-free and cost-effective technique. High electrical conductivity for poly(3-hexylthiophene) up to 21 S/cm has been achieved, using a commercially available electron acceptor as both a Lewis acid and an oxidizing agent. While we managed water-free solution-processing a three-time higher conductivity for P3HT with a very affordable/available chemical, near-field microscopy reveals the existence of concentrationdependent higher-conductivity micro-domains for which furthermore process optimization might access to even higher performances. In the perpetual quest of reaching higher performances for organic electronics, this work shall greatly unlock applications maturation requiring higher-scale processability and lower fabrication costs concomitant of higher performances and new functionalities, in the current context where understanding the doping mechanism of such class of materials remains of the greatest interest.

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“…Organic light‐emitting diodes (OLEDs) have received much attention in both academic and industrial laboratories, and were first reported by Tang and Van Slyke for solid‐state lighting sources and flat panel displays . OLEDs have achieved the overwhelming merits of lower power consumption, higher energy efficiency, longer operating life‐times and eco‐friendly constituents compared with traditional incandescent and mercury‐containing fluorescent lighting . The construction of solid‐state lighting has made great progress such as through the development of blue light‐emitting diodes.…”

Section: Introductionmentioning

confidence: 99%

2‐(4‐Ethoxy phenyl)‐4‐phenyl quinoline organic phosphor for solution processed blue organic light‐emitting diodes

Ghate

Kalyani²,

Dhoble

2018

Luminescence

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This paper reports the synthesis and characterization of 2-(4-ethoxyphenyl)-4-phenyl quinoline (OEt-DPQ) organic phosphor using an acid-catalyzed Friedlander reaction and the preparation of blended thin films by molecularly doping OEt-DPQ in poly(methyl methacrylate) (PMMA) at different wt%. The molecular structure of the synthesized phosphor was confirmed by Fourier transform infra-red (FTIR) spectroscopy and nuclear magnetic resonance spectra (NMR). Surface morphology and percent composition of the elements were assessed by scanning electron microscopy (SEM) and energy dispersive analysis of X-rays (EDAX). The thermal stability and melting point of OEt-DPQ and thin films were probed by thermo-gravimetric analysis (TGA)/differential thermal analysis (DTA) and were found to be 80°C and 113.6°C, respectively. UV-visible optical absorption spectra of OEt-DPQ in the solid state and blended films produced absorption bands in the range 260-340 nm, while photoluminescence (PL) spectra of OEt-DPQ in the solid state and blended thin films demonstrated blue emission that was registered at 432 nm when excited at 363-369 nm. However, solvated OEt-DPQ in chloroform, tetrahydrofuran or dichloromethane showed a blue shift of 31-43 nm. Optical absorption and emission parameters such as molar extinction coefficient (ε), energy gap (E ), transmittance (T), reflectance (R), refractive index (n), oscillator energy (E ) and oscillator strength (f), quantum yield (φ ), oscillator energy (E ), dispersion energy (E ), Commission Internationale de l'Éclairage (CIE) co-ordinates and energy yield fluorescence (E ) were calculated to assess the phosphor's suitability as a blue emissive material for opto-electronic applications such as organic light-emitting diodes (OLEDs), flexible displays and solid-state lighting technology.

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High-performance OLEDs and their application to lighting

Cited by 11 publications

References 12 publications

Organic Light - Emitting Diodes and their Applications

Organic Light - Emitting Diodes and their Applications

Concentration-control in all-solution processed semiconducting polymer doping and high conductivity performances

2‐(4‐Ethoxy phenyl)‐4‐phenyl quinoline organic phosphor for solution processed blue organic light‐emitting diodes

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