Metasurface-driven OLED displays beyond 10,000 pixels per inch

Science ◽  
2020 ◽  
Vol 370 (6515) ◽  
pp. 459-463 ◽  
Author(s):  
Won-Jae Joo ◽  
Jisoo Kyoung ◽  
Majid Esfandyarpour ◽  
Sung-Hoon Lee ◽  
Hyun Koo ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Light Emitting Diode ◽  
Light Emitters ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Luminescence Efficiency ◽  
Light Waves ◽  
Integrated Devices ◽  
Emission Modulation ◽  
And Control

Optical metasurfaces are starting to find their way into integrated devices, where they can enhance and control the emission, modulation, dynamic shaping, and detection of light waves. In this study, we show that the architecture of organic light-emitting diode (OLED) displays can be completely reenvisioned through the introduction of nanopatterned metasurface mirrors. In the resulting meta-OLED displays, different metasurface patterns define red, green, and blue pixels and ensure optimized extraction of these colors from organic, white light emitters. This new architecture facilitates the creation of devices at the ultrahigh pixel densities (>10,000 pixels per inch) required in emerging display applications (for instance, augmented reality) that use scalable nanoimprint lithography. The fabricated pixels also offer twice the luminescence efficiency and superior color purity relative to standard color-filtered white OLEDs.

scholarly journals Simple Acridan-Based Multi-Resonance Structures Enable Highly-Efficient Narrowband Green TADF Electroluminescence

2020 ◽  
Author(s):  
pengcheng jiang ◽  
Lisi Zhan ◽  
Xiaosong Cao ◽  
Xialei Lv ◽  
Shaolong Gong ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Bathochromic Shift ◽  
Wavelength Region ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Simple Modification ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Luminescence Efficiency

Multi-resonance thermally activated delayed fluorescence (MR-TADF) offered exceptional solution for narrowband organic light emitting diode (OLED) devices in terms of color purity and luminescence efficiency, while the development of new MR skeleton remained an exigent task, especially for long wavelength region. We hereby demonstrate that a simple modification of the B (boron)-N (nitrogen) framework by sp3 -carbon insertion would significant bathochromic shift the short-range chargetransfer emission and improve the device performances. The bis(acridan)phenylenebased skeleton developed in this contribution presented a non-planar conformation and allowed facile introduction of isolating units to prevent triplet-involved quenching, deriving two luminophores with quantum yields approaching 90% and narrow FWMHs below 30 nm in film state. Corresponding green-emissive devices realized superior performances comparing to the planar carbazolyl-based MR-TADF analogues, with a maximum external quantum efficiency (EQEmax) up to 28.2% and small efficiency rolloff without the involvement of any sensitizing host

scholarly journals Simple Acridan-Based Multi-Resonance Structures Enable Highly-Efficient Narrowband Green TADF Electroluminescence

2020 ◽  
Author(s):  
pengcheng jiang ◽  
Lisi Zhan ◽  
Xiaosong Cao ◽  
Xialei Lv ◽  
Shaolong Gong ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Bathochromic Shift ◽  
Wavelength Region ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Simple Modification ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Luminescence Efficiency

Multi-resonance thermally activated delayed fluorescence (MR-TADF) offered exceptional solution for narrowband organic light emitting diode (OLED) devices in terms of color purity and luminescence efficiency, while the development of new MR skeleton remained an exigent task, especially for long wavelength region. We hereby demonstrate that a simple modification of the B (boron)-N (nitrogen) framework by sp3 -carbon insertion would significant bathochromic shift the short-range chargetransfer emission and improve the device performances. The bis(acridan)phenylenebased skeleton developed in this contribution presented a non-planar conformation and allowed facile introduction of isolating units to prevent triplet-involved quenching, deriving two luminophores with quantum yields approaching 90% and narrow FWMHs below 30 nm in film state. Corresponding green-emissive devices realized superior performances comparing to the planar carbazolyl-based MR-TADF analogues, with a maximum external quantum efficiency (EQEmax) up to 28.2% and small efficiency rolloff without the involvement of any sensitizing host

scholarly journals Emergence and control of photonic band structure in stacked OLED microcavities

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
David Allemeier ◽  
Benjamin Isenhart ◽  
Ekraj Dahal ◽  
Yuki Tsuda ◽  
Tsukasa Yoshida ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Band Gap ◽  
Light Emitting Diode ◽  
Unit Cell ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Broadband Emission ◽  
The Individual ◽  
And Control ◽  
Photonic Band

AbstractWe demonstrate an electrically-driven metal-dielectric photonic crystal emitter by fabricating a series of organic light emitting diode microcavities in a vertical stack. The states of the individual microcavities are shown to split into bands of hybridized photonic energy states through interaction with adjacent cavities. The propagating photonic modes within the crystal depend sensitively on the unit cell geometry and the optical properties of the component materials. By systematically varying the metallic layer thicknesses, we show control over the density of states and band center. The emergence of a tunable photonic band gap due to an asymmetry-introduced Peierls distortion is demonstrated and correlated to the unit cell configuration. This work develops a class of one dimensional, planar, photonic crystal emitter architectures enabling either narrow linewidth, multi-mode, or broadband emission with a high degree of tunability.

Effects of Nitridation Time on Top-emission Inverted Organic Light Emitting Diode

PIERS Online ◽  
2007 ◽  
Vol 3 (6) ◽  
pp. 821-824 ◽  
Author(s):  
Chien-Chang Tseng ◽  
Liang-Wen Ji ◽  
Yu Sheng Tsai ◽  
Fuh-Shyang Juang
Keyword(s):  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Nitridation Time ◽  
Organic Light
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