Challenges For Flat Panel Display Phosphors

1994 ◽  
Vol 345 ◽  
Author(s):  
H. P. Maruska ◽  
T. Parodos ◽  
N. M. Kalkhoran ◽  
W. D. Halverson
Keyword(s):  
Thin Film ◽  
Ion Implantation ◽  
Flat Panel Display ◽  
High Definition ◽  
Critical Material ◽  
Cathode Ray Tubes ◽  
Full Color ◽  
Color Displays ◽  
Single Host ◽  
Plasma Displays

AbstractPhosphors are a class of materials which emit visible light when impacted by either electrons or photons. Phosphors are the critical material in all self-emissive displays. The major display technologies which depend on phosphors are cathode ray tubes, flat cathode ray tubes (especially, field emission displays), thin film electroluminescent displays, and gas discharge plasma displays. Each of these technologies started with phosphors prepared in powder form, sprayed or screen printed onto a faceplate suitable for viewing. Electroluminescent displays have largely converted to thin film phosphors. It can be expected that, for many applications, the other competing technologies will also come to rely on more robust, high definition, thin film phosphors. Presently, full color displays must utilize several deposition and etching procedures to prepare the red, green, and blue pixels. Ion implantation of color centers is now paving the way for producing full color displays in a single host phosphor. We shall discuss the present limitations that compromise full color self-emissive displays, and present state-of-the-art solutions based on thin films and ion implantation.

scholarly journals Transfer-printed, tandem microscale light-emitting diodes for full-color displays

2021 ◽  
Vol 118 (18) ◽  
pp. e2023436118
Author(s):  
Lizhu Li ◽  
Guo Tang ◽  
Zhao Shi ◽  
He Ding ◽  
Changbo Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Light Emitting Diodes ◽  
Performance Enhancement ◽  
Optical Filter ◽  
Transfer Printing ◽  
Light Emitting ◽  
Full Color ◽  
Color Displays ◽  
Film Dielectric ◽  
Display Systems

Inorganic semiconductor-based microscale light-emitting diodes (micro-LEDs) have been widely considered the key solution to next-generation, ubiquitous lighting and display systems, with their efficiency, brightness, contrast, stability, and dynamic response superior to liquid crystal or organic-based counterparts. However, the reduction of micro-LED sizes leads to the deteriorated device performance and increased difficulties in manufacturing. Here, we report a tandem device scheme based on stacked red, green, and blue (RGB) micro-LEDs, for the realization of full-color lighting and displays. Thin-film micro-LEDs (size ∼100 μm, thickness ∼5 μm) based on III–V compound semiconductors are vertically assembled via epitaxial liftoff and transfer printing. A thin-film dielectric-based optical filter serves as a wavelength-selective interface for performance enhancement. Furthermore, we prototype arrays of tandem RGB micro-LEDs and demonstrate display capabilities. These materials and device strategies provide a viable path to advanced lighting and display systems.

Ion-Implanted Thin Film Phosphors for Full-Color Field Emission Displays

1993 ◽  
Vol 316 ◽  
Author(s):  
Nader M. Kalkhoran ◽  
H. Paul Maruska ◽  
Fereydoon Namavar
Keyword(s):  
Thin Film ◽  
Ion Implantation ◽  
Field Emission ◽  
Low Cost ◽  
Single Layer ◽  
Implantation Technique ◽  
Visible Range ◽  
Full Color ◽  
Field Emission Displays ◽  
Color Field

ABSTRACTWe have investigated the application of ion implantation technique for introducing activator and co-activator ions into host materials such as ZnS and Zn2SiO4, and have produced phosphors with differing emission peaks throughout the visible range. A number of different ions including, Mn+, Al+ and rare-earth metals have been implanted. Zn2SiO4:Mn showed bright yellow cathodoluminescence. We have demonstrated that by varying the parameters for ion implantation and annealing, a single ZnS sample with emission peaks ranging from violet to yellow can be produced; i.e, chromaticity engineering. In one case, our results indicated that photoluminescence (PL) spectrum of ZnS phosphors shifts from blue to green by increasing the dose of implanted A+ ions. The Al+-implanted ZnS samples showed emission peaks shifting from 440 to 510 nm when the aluminum dose was raised from 1 × 1015 to 1 × 1017 A1+/cm2. Therefore, by activating color centers in thin film phosphors using ion implantation, efficient and low-cost full-color field emission displays can be fabricated on a single layer of host material.

Full-color Thin Film ZnGa2O4 Phosphors by Ion Implantation

1997 ◽  
Vol 471 ◽  
Author(s):  
N. M. Kalkhoran ◽  
D. A. Trivedi ◽  
W. D. Halverson ◽  
S. M. Vernon
Keyword(s):  
Thin Film ◽  
Ion Implantation ◽  
Surface Texturing ◽  
Rf Sputtering ◽  
High Brightness ◽  
Full Color ◽  
Luminescence Efficiency ◽  
Cie Chromaticity ◽  
Bright Luminescence ◽  
Ion Implanted

ABSTRACTFull-color cathodoluminescence (CL) characteristics of ion implanted ZnGa2O4 thin film phosphors deposited by rf sputtering have been investigated. High brightness red (R) and green (G) CL was obtained from Eu and Mn-implanted ions, respectively. Blue (B) emission has been achieved by Ce ion implantation or from high temperature annealed, self-activated films. RGB emissions of ion implanted ZnGa2O4 thin film phosphors are well saturated and enclose a larger area surrounding the central “white” zone of CIE chromaticity chart than standard CRT phosphors. Luminescence efficiency enhancements of up to 40% have been achieved through surface texturing of the substrate prior to phosphor deposition. First demonstration of bright luminescence in ion implanted ZnGa2O4 films on flexible polyimide substrates is reported.

Mo-doped, Cr-Doped, and Mo–Cr codoped TiO2 thin-film photocatalysts by comparative sol-gel spin coating and ion implantation

2021 ◽  
Vol 46 (24) ◽  
pp. 12961-12980
Author(s):  
Amanda Chen ◽  
Wen-Fan Chen ◽  
Tina Majidi ◽  
Bernadette Pudadera ◽  
Armand Atanacio ◽  
...  
Keyword(s):  
Thin Film ◽  
Ion Implantation ◽  
Spin Coating ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Codoped Tio2

Inverters Using Only N-Type Indium Gallium Zinc Oxide Thin Film Transistors for Flat Panel Display Applications

2011 ◽  
Vol 50 (3) ◽  
pp. 03CB06 ◽  
Author(s):  
Tong-Hun Hwang ◽  
Ik-Seok Yang ◽  
Oh-Kyong Kwon ◽  
Min-Ki Ryu ◽  
Choon-Won Byun ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Thin Film Transistors ◽  
Oxide Thin Film ◽  
Indium Gallium Zinc Oxide ◽  
Flat Panel Display ◽  
Zinc Oxide Thin Film ◽  
Flat Panel ◽  
Indium Gallium

Critical issues in enhancing brightness in thin film phosphors for flat-panel display applications

2002 ◽  
Vol 197-198 ◽  
pp. 321-324 ◽  
Author(s):  
R.K Singh ◽  
Z Chen ◽  
D Kumar ◽  
K Cho ◽  
M Ollinger
Keyword(s):  
Thin Film ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Critical Issues

scholarly journals Operando direct observation of spin-states and charge-trappings of blue light-emitting-diode materials in thin-film devices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fumiya Osawa ◽  
Kazuhiro Marumoto
Keyword(s):  
Blue Light ◽  
High Performance ◽  
Density Functional ◽  
Light Emitting Diode ◽  
Green Light ◽  
Spin States ◽  
Light Emitting ◽  
Full Color ◽  
Color Displays ◽  
Materials Used

Abstract Spin-states and charge-trappings in blue organic light-emitting diodes (OLEDs) are important issues for developing high-device-performance application such as full-color displays and white illumination. However, they have not yet been completely clarified because of the lack of a study from a microscopic viewpoint. Here, we report operando electron spin resonance (ESR) spectroscopy to investigate the spin-states and charge-trappings in organic semiconductor materials used for blue OLEDs such as a blue light-emitting material 1-bis(2-naphthyl)anthracene (ADN) using metal–insulator–semiconductor (MIS) diodes, hole or electron only devices, and blue OLEDs from the microscopic viewpoint. We have clarified spin-states of electrically accumulated holes and electrons and their charge-trappings in the MIS diodes at the molecular level by directly observing their electrically-induced ESR signals; the spin-states are well reproduced by density functional theory. In contrast to a green light-emitting material, the ADN radical anions largely accumulate in the film, which will cause the large degradation of the molecule and devices. The result will give deeper understanding of blue OLEDs and be useful for developing high-performance and durable devices.

scholarly journals Advances in Quantum-Dot-Based Displays

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1327 ◽  
Author(s):  
Yu-Ming Huang ◽  
Konthoujam James Singh ◽  
An-Chen Liu ◽  
Chien-Chung Lin ◽  
Zhong Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Flexible Substrate ◽  
Potential Candidate ◽  
White Leds ◽  
Full Color ◽  
Color Displays ◽  
High Illumination ◽  
Coating Methods ◽  
Good Potential

In terms of their use in displays, quantum dots (QDs) exhibit several advantages, including high illumination efficiency and color rendering, low-cost, and capacity for mass production. Furthermore, they are environmentally friendly. Excellent luminescence and charge transport properties of QDs led to their application in QD-based light-emitting diodes (LEDs), which have attracted considerable attention in display and solid-state lighting applications. In this review, we discuss the applications of QDs which are used on color conversion filter that exhibit high efficiency in white LEDs, full-color micro-LED devices, and liquid-type structure devices, among others. Furthermore, we discuss different QD printing processes and coating methods to achieve the full-color micro-LED. With the rise in popularity of wearable and see-through red, green, and blue (RGB) full-color displays, the flexible substrate is considered as a good potential candidate. The anisotropic conductive film method provides a small controllable linewidth of electrically conductive particles. Finally, we discuss the advanced application for flexible full-color and highly efficient QD micro-LEDs. The general conclusion of this study also involves the demand for a more straightforward QD deposition technique, whose breakthrough is expected.

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