Organic light-emitting-diode lighting overview
TLDR
It is shown that OLED lighting products should be positioned as luminaires and not light bulbs, which affects both the performance and price expectations, and why there is optimism that, with volume production, OLED lighting can be competitive against other Luminaires even on the first-cost.Abstract:
For organic light-emitting-diode (OLED) lighting to be successful, it is critical that it be properly positioned in the marketplace. It is also critical that both the performance and cost be competitive against other lighting technologies in the selected marketplace. This presentation gives an overview of OLED lighting technology from these perspectives. It shows that OLED lighting products should be positioned as luminaires and not light bulbs, which affects both the performance and price expectations. Laboratory OLED devices already demonstrated efficacies that are more than competitive against luminaires based on other lighting technologies. There is potential for substantial further improvement in efficacy. The greatest opportunities come from light-extraction efficiency improvements and from an improved blue emitting system. There has been great recent progress in the OLED device lifetime. To be acceptable as luminaires, however, OLED may need even more lifetime improvements. Not all the improvements need to come from OLED technology improvement, however. We discuss other means to effectively improve the lifetime of OLED lighting panels and show why there is optimism that, with volume production, OLED lighting can be competitive against other luminaires even on the first-costread more
Citations
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Journal ArticleDOI
Degradation Mechanisms and Reactions in Organic Light-Emitting Devices.
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Device efficiency of organic light-emitting diodes: Progress by improved light outcoupling†
TL;DR: In this article, the authors review the working principles of OLEDs and highlight ongoing efforts to improve their efficiency, in particular by coupling out more light, and highlight the challenges for further device improvements.
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Low-driving-voltage blue phosphorescent organic light-emitting devices with external quantum efficiency of 30%.
TL;DR: A homoleptic iridium (iii) tris(pheny-limidazolinate) complex realizes a high EQE of 30%, a low turn-on voltage of 2.5 V, and a small efficiency roll-off in a blue organic light-emitting device (OLED).
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Recent Progress in Phosphorescent Organic Light‐Emitting Devices
Hisahiro Sasabe,Junji Kido +1 more
TL;DR: In this paper, a review of recent developments in phosphorescent OLED technology, especially from materials chemistry, is presented, with the aim of achieving high internal quantum efficiency, low operation voltage, and high light-outcoupling efficiency at the same time.
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White Organic LED with a Luminous Efficacy Exceeding 100 lm W−1 without Light Out-Coupling Enhancement Techniques
Sheng-Fan Wu,Si-Hua Li,Ya-Kun Wang,Chen-Chao Huang,Qi Sun,Jiao-Jiao Liang,Liang-Sheng Liao,Man-Keung Fung +7 more
TL;DR: In this paper, an ultra-efficient white organic light-emitting diodes (OLEDs) is discussed based on a newly designed thermally activated delayed fluorescent exciplex host, which delivers an unusually high forward-viewing LE of 105.0 lm W−1 and external quantum efficiency (EQE) ηext of ≈30% (without using any optical outcoupling techniques).
References
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White organic light-emitting diodes with fluorescent tube efficiency
Sebastian Reineke,Frank Lindner,Gregor Schwartz,Nico Seidler,Karsten Walzer,Björn Lüssem,Karl Leo +6 more
TL;DR: An improved OLED structure which reaches fluorescent tube efficiency and focuses on reducing energetic and ohmic losses that occur during electron–photon conversion, which could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.
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TL;DR: In this paper, a simple encapsulation technique for organic light emitting devices (OLEDs) is presented, where the degradation of a population of OLEDs is studied and it is shown that the lifetime of encapsulated devices is increased by more than two orders of magnitude over that of unencapsulated devices.
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A high-extraction-efficiency nanopatterned organic light-emitting diode
Yong-Jae Lee,Se-Heon Kim,Joon Huh,Guk-Hyun Kim,Yong-Hee Lee,Sang-Hwan Cho,Yoon-Chang Kim,Young Rag Do +7 more
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A review on the light extraction techniques in organic electroluminescent devices
TL;DR: In this article, the authors report recent advances in light out-coupling techniques, such as, substrate modification methods, use of scattering medium, micro-lens arrays, microcavity effect, photonic crystals and nano-particles, nano-structures and surface plasmonenhanced techniques that have been implemented to enhance the external extraction efficiency of organic electro-luminescent devices.