Quantum-dot color wheel for projection displays DOI Creative Commons

Yinguo Yan,

Yuze Xiao,

Junhu Cai

et al.

Optica, Journal Year: 2023, Volume and Issue: 10(11), P. 1559 - 1559

Published: Oct. 24, 2023

A color wheel (CW) is one of the most essential devices for contemporary projection displays because it provides initialization definition and determines performance whole system. However, conventional wheels remain limited in terms efficiency light-absorbing material time sequential generation. Quantum dots, found 1981 known as a kind quasi-zero-dimensional nanomaterial, exhibit excellent features due to their quantum confinement effect, which won 2023 Nobel Prize Chemistry. Inspired by this, paper systematically demonstrates quantum-dot (QD-CW) device through theoretical derivation, simulation analysis, experimental verification. The model define duty circle ratio presented QD-CW verified Monte Carlo ray-tracing simulation. In verification, realized multiple rounds photolithography process, then assembled into blue laser pumped prototype full-color display. chromaticity coordinates white-balanced output are finally located at (0.317,0.338), matches well with standard D65 source. gamut area reaches 116.6% NTSC, average light conversion (LCE) prepared 57.0%. proposed has ∼40% higher 1.2× LCE than CW device. These exciting findings show groundbreaking approach generation displays, expected shed on other high-quality display applications.

Language: Английский

Wearable and Implantable Light-Emitting Diodes and Their Biomedical Applications DOI
Gi Doo, Dae‐Hyeong Kim, Dong Chan Kim

et al.

Korean Journal of Chemical Engineering, Journal Year: 2024, Volume and Issue: 41(1), P. 1 - 24

Published: Jan. 1, 2024

Language: Английский

Citations

19
Highly efficient printed quantum dot light-emitting diodes through ultrahigh-definition double-layer transfer printing DOI
Jisu Yoo, Kyunghoon Lee,

U Jeong Yang

et al.

Nature Photonics, Journal Year: 2024, Volume and Issue: 18(10), P. 1105 - 1112

Published: Aug. 2, 2024

Language: Английский

Citations

19
Photonic Nanomaterials for Wearable Health Solutions DOI Creative Commons
Taewoong Park, Jung Woo Leem, Young L. Kim

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Abstract This review underscores the transformative potential of photonic nanomaterials in wearable health technologies, driven by increasing demands for personalized monitoring. Their unique optical and physical properties enable rapid, precise, sensitive real‐time monitoring, outperforming conventional electrical‐based sensors. Integrated into ultra‐thin, flexible, stretchable formats, these materials enhance compatibility with human body, enabling prolonged wear, improved efficiency, reduced power consumption. A comprehensive exploration is provided integration devices, addressing material selection, light‐matter interaction principles, device assembly strategies. The highlights critical elements such as form factors, sensing modalities, data communication, representative examples skin patches contact lenses. These devices precise monitoring management biomarkers diseases or biological responses. Furthermore, advancements approaches have paved way continuum care systems combining multifunctional sensors therapeutic drug delivery mechanisms. To overcome existing barriers, this outlines strategies design, engineering, system integration, machine learning to inspire innovation accelerate adoption next‐generation health, showcasing their versatility digital applications.

Language: Английский

Citations

3
Energy-saving chromium-activated garnet-structured phosphor-converted near-infrared light-emitting diodes DOI
Veeramani Rajendran, Wen‐Tse Huang, Kuan‐Chun Chen

et al.

Journal of Materials Chemistry C, Journal Year: 2022, Volume and Issue: 10(39), P. 14367 - 14378

Published: Jan. 1, 2022

Phosphor-converted near-infrared light-emitting diodes based on garnet structure as the host for chromium incorporation are promising light sources modern compact devices and also an excellent alternative to traditional tungsten lamps.

Language: Английский

Citations

50
Progress in Color Conversion Technology for Micro‐LED DOI
Teng Ma, Jun Chen, Ziyi Chen

et al.

Advanced Materials Technologies, Journal Year: 2022, Volume and Issue: 8(1)

Published: July 25, 2022

Abstract With the continuous improvement of display demand in scientific research and market, Micro‐light‐emitting diode (LED) has emerged as a new generation technology. its excellent performance color, resolution, life, energy consumption, Micro‐LED shined brilliantly market recent years. This review introduces methods for realizing full‐color through color conversion from perspective existing technologies, including preparation chip, process early passive matrix driving method to active method, layer by inkjet printing, photolithography, nanoimprinting. The current achievements challenges encountered are systematically described. It is intended provide readers researchers with some inductive materials ideas, further promote development Micro‐LED.

Language: Английский

Citations

48
Unraveling Luminescent Energy Transfer Pathways: Futuristic Approach of Miniature Shortwave Infrared Light-Emitting Diode Design DOI
Veeramani Rajendran, Kuan‐Chun Chen, Wen‐Tse Huang

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(5), P. 2395 - 2400

Published: April 26, 2023

Phosphor-converted shortwave infrared phosphor light-emitting diodes (pc-SWIR LEDs, 900–1700 nm) are promising next-generation portable light sources for spectroscopy, security, optical communication, and medical applications. A typical design strategy involves energy transfer from Cr3+ to Ni2+, thus, Cr3+–Cr3+ pairs Ni2+ ions is important but challenging. Here, we report a Sr1–xLaxAl5.92Cr0.08Ga6–xO19:xNi2+ (x = 0–0.09) series the SWIR emissions range of 900–1600 nm due an pair Ni2+. Short-range structural studies using electron paramagnetic resonance magnetometry measurements reveal that likely exist as isolated Cr3+–Ni2+ rather than forming Ni2+–Ni2+ pairs. The fabricated prototype pc-LED delivers radiant flux 12.43 mW under 350 mA driving current. This work provides insights into codopant phosphors.

Language: Английский

Citations

33
Ultrahigh-resolution full-color micro-LED array with enhanced efficiency based on a color conversion technique DOI

Gaurav Ashish,

Chih‐Yuan Tsai,

Guan-Wen Wang

et al.

Photonics Research, Journal Year: 2023, Volume and Issue: 11(6), P. 925 - 925

Published: March 29, 2023

Micro-light emitting diodes (μLEDs) with remarkable advantages are becoming mainstream in next-generation display technologies such as augmented reality/virtual reality displays. However, further development of μLEDs still faces significant challenges, including mass transfer yield. Here, we report color conversion layer (CCL)-based, full-color, highly efficient μLED arrays a solution to address this challenging issue. Further amalgamating CCL purity enhancement film enables us realize 7 μm ×7 subpixel fluorescent gamut 95.34% DCI-P3, resulting an overall 1588 PPI (pixel per inch). Our results provide promising technique for fabricating higher PPI-based technology.

Language: Английский

Citations

24
Spontaneous Interface Healing by a Dynamic Liquid‐Crystal Transition for High‐Performance Perovskite Solar Cells DOI
Xinyi Du, Lu Zhang, Ran Chen

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(49)

Published: Oct. 21, 2022

Low-temperature solution processing of thin-film semiconductors is more cost-effective than traditional vacuum processing; however, it leads to defects during fast bulk crystallization and residual tensile stress. Herein, a new strategy dynamic liquid-crystal transition (DLCT) developed solve these problems in one step. The design principle used suggest that the DLCT molecule should firstly interact with perovskite grains meanwhile go through spontaneously heal interface. A thermotropic LC (CBO6SS6OCB) then designed demonstrate strategy. interacting colloid forms an intermediate adduct retard crystallization. annealing processes stimulate concentrated solid, causing flow electron transport layer release stress attain improved extraction. Consequently, device efficiency increased 24.38%, where its VOC 1.184 V among best for formamidine-based solar cells. Furthermore, ambient stability (93.0% initial after 2000 h aging) light (96.3% 500 are much improved. This work conceives engineering additive phase high-performance

Language: Английский

Citations

34
Synthesizing Bright CsPbBr3 Perovskite Nanocrystals with High Purification Yields and Their Composites with In Situ-Polymerized Styrene for Light-Emitting Diode Applications DOI
Yuting Cai, Peijuan Zhang, Wenhao Bai

et al.

ACS Sustainable Chemistry & Engineering, Journal Year: 2022, Volume and Issue: 10(22), P. 7385 - 7393

Published: May 25, 2022

The room-temperature ligand-assisted reprecipitation (LARP) technique has been established as a facile and large-scale method for synthesizing lead halide perovskite nanocrystals (PNCs). However, it is difficult to purify these PNCs through precipitation/redispersion processes, arising from their fragile crystal structure low PNC concentration. In this paper, we proposed apply anisole the reaction solvent, which slightly increased polarity relative often used toluene. As result, as-synthesized CsPbBr3 can be easily isolated crude solution direct centrifugation without adding antisolvents. obtained purified (OA/OAm-CsPbBr3) capped with oleic acid (OA) oleylamine (OAm) had 50-fold improvement in molar production yields. Meanwhile, they showed relatively high photoluminescence quantum yield (PLQY) of 64%. This also feasible more red-emitting PNCs. CsPbBrI2 an emission maximum at 629 nm PLQY 65% 7-fold Furthermore, when bromide-rich ligands [i.e., cetyltrimethylammonium bromide (CTAB)] were used, (CTAB-CsPbBr3) further increase around 90%. Subsequently, coating polystyrene (PS), mild polymerization was by adopting low-temperature initiator. fabricated CTAB-CsPbBr3@PS composite higher (77% vs 21%) enhanced stability against water heat, compared that OA/OAm-CsPbBr3@PS composite. Finally, demonstrated produce super-wide color gamut (130% NTSC) backlights luminous efficacy 71.1 lm/W.

Language: Английский

Citations

30
Fabricating Quantum Dot Color Conversion Layers for Micro-LED-Based Augmented Reality Displays DOI Creative Commons
Chien‐Chung Lin,

Kai-Ling Liang,

Han-Yu Chao

et al.

ACS Applied Optical Materials, Journal Year: 2023, Volume and Issue: 2(7), P. 1303 - 1313

Published: Aug. 2, 2023

Colloidal quantum dots have attracted much attention for their potential application in the color conversion scheme of next-generation microdisplays. One possible methods to pattern these nanoparticles into arrays is use dot photoresists. We will demonstrate a high-resolution layer with 1.5 μm by 4 subpixel size and pixel density exceeding 2000 pixels-per-inch (PPI). The photonic characteristics are analyzed, estimated efficiencies 9.51% green 16.55% red. A full National Television Standards Committee (NTSC) (gamut coverage: 100%, area ratio: 114%) gamut achieved 992-PPI microdisplay adding an optical reflector on top. Without this reflector, coverage drops 82.9%. comparative study found steady improvement photoresist method over past decade, even higher resolution can be expected.

Language: Английский

Citations

20