scholarly journals High-Performance Color-Converted Full-Color Micro-LED Arrays

2020 ◽  
Vol 10 (6) ◽  
pp. 2112 ◽  
Author(s):  
Won Hee Kim ◽  
Young Jae Jang ◽  
Ja-Yeon Kim ◽  
Myungsoo Han ◽  
MinJae Kang ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
High Performance ◽  
Efficient Technique ◽  
Full Color ◽  
Conversion Materials ◽  
Color Conversion ◽  
Led Arrays ◽  
Lithography Technique

Color-converted micro-LED displays consisting of mono-blue-colored micro LED arrays and color-conversion materials have been used to achieve full color while reliving the transfer and epitaxial growth of three different-colored micro LEDs. An efficient technique is suggested to deposit the color-conversion layers on the blue micro LEDs by using a mixture of photo-curable acrylic and nano-organic color-conversion materials through the conventional lithography technique. This study attempts to provide a solution to fabricate full-color micro-LED displays.

scholarly journals Tripling the Optical Efficiency of Color-Converted Micro-LED Displays with Funnel-Tube Array

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 39 ◽  
Author(s):  
Fangwang Gou ◽  
En-Lin Hsiang ◽  
Guanjun Tan ◽  
Yi-Fen Lan ◽  
Cheng-Yeh Tsai ◽  
...  
Keyword(s):  
Light Intensity ◽  
Epitaxial Growth ◽  
Optical Density ◽  
Contrast Ratio ◽  
Optical Efficiency ◽  
Full Color ◽  
Led Array ◽  
Conversion Materials ◽  
Low Efficiency ◽  
Color Conversion

Color-converted micro-LED displays consist of a mono-color micro-LED array and color conversion materials to achieve full color, while relieving the burden of epitaxial growth of three-color micro-LEDs. However, it usually suffers from low efficiency and color crosstalk due to the limited optical density of color conversion materials. With funnel-tube array, the optical efficiency of the color-converted micro-LED display can be improved by ~3X, while the crosstalk is eliminated. After optimization of the tapper angle, the ambient contrast ratio is also improved due to higher light intensity.

scholarly journals Use of Recycling-Reflection Color-Purity Enhancement Film to Improve Color Purity of Full-Color Micro-LEDs

2022 ◽  
Vol 17 (1) ◽  
Author(s):  
Zhi Ting Ye ◽  
Jun-Yi Wu
Keyword(s):  
Conversion Efficiency ◽  
High Efficiency ◽  
Color Purity ◽  
Incident Wavelength ◽  
Excitation Light ◽  
Full Color ◽  
Conversion Materials ◽  
Pass Through ◽  
Color Conversion ◽  
Light Conversion Efficiency

Abstract A common full-color method involves combining micro-light-emitting diodes (LEDs) chips with color conversion materials such as quantum dots (QDs) to achieve full color. However, during color conversion between micro-LEDs and QDs, QDs cannot completely absorb incident wavelengths cause the emission wavelengths that including incident wavelengths and converted wavelength through QDs, which compromises color purity. The present paper proposes the use of a recycling-reflection color-purity-enhancement film (RCPEF) to reflect the incident wavelength multiple times and, consequently, prevent wavelength mixing after QDs conversion. This RCPEF only allows the light of a specific wavelength to pass through it, exciting blue light is reflected back to the red and green QDs layer. The prototype experiment indicated that with an excitation light source wavelength of 445.5 nm, the use of green QDs and RCPEFs increased color purity from 77.2% to 97.49% and light conversion efficiency by 1.97 times and the use of red QDs and RCPEFs increased color purity to 94.68% and light conversion efficiency by 1.46 times. Thus, high efficiency and color purity were achieved for micro-LEDs displays. Graphical Abstract

scholarly journals Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 436 ◽  
Author(s):  
Shao-Yu Chu ◽  
Hung-Yu Wang ◽  
Ching-Ting Lee ◽  
Hsin-Ying Lee ◽  
Kai-Ling Laing ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Absorption ◽  
Bragg Reflector ◽  
Color Purity ◽  
Distributed Bragg Reflector ◽  
Light Emitting ◽  
Full Color ◽  
Conversion Materials ◽  
Bottom Side ◽  
Color Conversion

In this study, CdSe/ZnS core-shell quantum dots (QDs) with various dimensions were used as the color conversion materials. QDs with dimensions of 3 nm and 5 nm were excited by gallium nitride (GaN)-based blue micro-light-emitting diodes (micro-LEDs) with a size of 30 μm × 30 μm to respectively form the green and red lights. The hybrid Bragg reflector (HBR) with high reflectivity at the regions of the blue, green, and red lights was fabricated on the bottom side of the micro-LEDs to reflect the downward light. This could enhance the intensity of the green and red lights for the green and red QDs/micro-LEDs to 11% and 10%. The distributed Bragg reflector (DBR) was fabricated on the QDs color conversion layers to reflect the non-absorbed blue light that was not absorbed by the QDs, which could increase the probability of the QDs excited by the reflected blue light. The blue light absorption material was deposited on the DBR to absorb the blue light that escaped from the DBR, which could enhance the color purity of the resulting green and red QDs/micro-LEDs to 90.9% and 90.3%, respectively.

scholarly journals 39.1: Invited Paper: Organic Color‐Conversion Materials for Full‐Color MicroLED Displays

2021 ◽  
Vol 52 (S1) ◽  
pp. 269-269
Author(s):  
Shou-Cheng Dong ◽  
Yibin Jiang ◽  
Ching W. Tang
Keyword(s):  
Full Color ◽  
Conversion Materials ◽  
Color Conversion

Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

2020 ◽  
Author(s):  
Pengbo Han ◽  
Zeng Xu ◽  
Chengwei Lin ◽  
Dongge Ma ◽  
Anjun Qin ◽  
...  
Keyword(s):  
High Performance ◽  
General Strategy ◽  
Flat Panel Displays ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Deep Blue ◽  
Full Color ◽  
High Emission ◽  
White Oleds ◽  
Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIE<sub>x,y</sub> = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A<sup>-1</sup>, 60.7 lm W<sup>-1</sup> and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

High-Performance and Low-Power Full Color Reflective LCD for New Applications

2019 ◽  
pp. 1411
Author(s):  
Hiroyuki Hakoi ◽  
Ming Ni ◽  
Junichi Hashimoto ◽  
Takashi Sato ◽  
Shinji Shimada ◽  
...  
Keyword(s):  
Low Power ◽  
High Performance ◽  
Full Color ◽  
New Applications

van der Waals Epitaxial Growth of Borophene on a Mica Substrate toward a High-Performance Photodetector

2021 ◽  
Author(s):  
Zenghui Wu ◽  
Guoan Tai ◽  
Runsheng Liu ◽  
Chuang Hou ◽  
Wei Shao ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
High Performance ◽  
Van Der Waals ◽  
Mica Substrate

Color conversion using Quantum Dots on high-brightness GaN LED arrays for display application

2015 ◽  
Vol 1788 ◽  
pp. 19-21 ◽  
Author(s):  
Audrey Sanchot ◽  
Marianne Consonni ◽  
Stéphanie Le Calvez ◽  
Ivan C. Robin ◽  
François Templier
Keyword(s):  
Quantum Dots ◽  
Complete Disappearance ◽  
High Brightness ◽  
Color Saturation ◽  
Deep Blue ◽  
Gan Led ◽  
Color Conversion ◽  
Led Arrays

ABSTRACTWe have demonstrated the color conversion of blue micro-LEDs by means of QDs. In this paper, we will present characterizations that highlight this phenomenon. We already obtained conversion with a complete disappearance of the blue incident signal and a strong color saturation from deep blue (x=0,1626; y=0,0144) to deep red (x=0,6743; y=0,3244).

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