Ce-Doped La3Si6.5Al1.5N9.5O5.5, a Rare Highly Efficient Blue-Emitting Phosphor at Short Wavelength toward High Color Rendering White LED Application

2017 ◽  
Vol 9 (27) ◽  
pp. 22665-22675 ◽  
Author(s):  
Chun-Yun Wang ◽  
Takashi Takeda ◽  
Otmar Melvin ten Kate ◽  
Masataka Tansho ◽  
Kenzo Deguchi ◽  
...  
Keyword(s):  
Short Wavelength ◽  
White Led ◽  
Highly Efficient ◽  
Color Rendering

Fabrication of LED Based on III-V Nitride and its Applications

2004 ◽  
Vol 831 ◽  
Author(s):  
Naoki Shibata
Keyword(s):  
Light Source ◽  
Short Wavelength ◽  
Light Output ◽  
White Led ◽  
Nitride Semiconductors ◽  
Light Output Power ◽  
Air Conditioners ◽  
Air Purifier ◽  
Chemical Content ◽  
Color Rendering

ABSTRACTShort wavelength LED (TG Purple) based on III-V nitride semiconductors is established in addition to blue and green. This short wavelength LED is realized by adjusting “Indium” chemical content of the well layer. Light output power of “TG Purple” is high and FWHM is narrow. “TG Purple” is applied to light source of white LED. Combination of “TG Purple” and various phosphors can generate white light with high luminous intensity and good color rendering. “TG Purple” is also applied to light source of air-purifier. This air-purifier was equipped in a car and several applications of this system are widely utilized in room air conditioners and refrigerators.

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from garnet-type Ca2YZr2(AlO4)3:Ce3+,Tb3+ phosphors for white LEDs with high color rendering index

2019 ◽  
Vol 7 (34) ◽  
pp. 10471-10480 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Leds ◽  
Highly Efficient ◽  
Color Rendering Index ◽  
Color Rendering

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from Ca2YZr2(AlO4)3:Ce3+,Tb3+ garnet phosphors, which showed great potential for application in warm-white LEDs with high color rendering index.

Moisture-resistant and highly efficient narrow-band red-emitting fluoride phosphor K2NaGaF6:Mn4+ for warm white LED application

2019 ◽  
Vol 7 (26) ◽  
pp. 7906-7914 ◽  
Author(s):  
Jun Gao ◽  
Haomiao Zhu ◽  
Renfu Li ◽  
Decai Huang ◽  
Benlong Luo ◽  
...  
Keyword(s):  
Narrow Band ◽  
White Led ◽  
Site Occupation ◽  
Highly Efficient ◽  
Moisture Resistant

The site occupation/evolution of Mn4+ ions in K2NaGaF6 crystals and their excellent moisture-resistant performance.

scholarly journals A comparison between a white LED confocal imaging system and a conventional flash fundus camera using chromaticity analysis

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Valentina Sarao ◽  
Daniele Veritti ◽  
Enrico Borrelli ◽  
Srini Vas R. Sadda ◽  
Enea Poletti ◽  
...  
Keyword(s):  
Imaging System ◽  
Color Images ◽  
Confocal Imaging ◽  
Fundus Images ◽  
White Led ◽  
Discriminative Power ◽  
High Quality ◽  
Fundus Camera ◽  
Clear Shift ◽  
Color Rendering

Abstract Background Conventional flash fundus cameras capture color images that are oversaturated in the red channel and washed out in the green and blue channels, resulting in a retinal picture that often looks flat and reddish. A white LED confocal device was recently introduced to provide a high-quality retinal image with enhanced color fidelity. In this study, we aimed to evaluate the color rendering properties of the white LED confocal system and compare them to those of a conventional flash fundus camera through chromaticity analysis. Methods A white LED confocal device (Eidon, Centervue, Padova, Italy) and a traditional flash fundus camera (TRC-NW8, Topcon Corporation, Tokyo, Japan) were used to capture fundus images. Color images were evaluated with respect to chromaticity. Analysis was performed according to the image color signature. The color signature of an image was defined as the distribution of its pixels in the rgb chromaticity space. The descriptors used for the analysis are the average and variability of the barycenter positions, the average of the variability and the number of unique colors (NUC) of all signatures. Results Two hundred thirty-three color photographs were acquired with each retinal camera. The images acquired by the confocal white LED device demonstrated an average barycenter position (rgb = [0.448, 0.328, 0.224]) closer to the center of the chromaticity space, while the conventional fundus camera provides images with a clear shift toward red at the expense of the blue and green channels (rgb = [0.574, 0.278, 0.148] (p < 0.001). The variability of the barycenter positions was higher in the white LED confocal system than in the conventional fundus camera. The average variability of the distributions was higher (0.003 ± 0.007, p < 0.001) in the Eidon images compared to the Topcon camera, indicating a greater richness of color. The NUC percentage was higher for the white LED confocal device than for the conventional flash fundus camera (0.071% versus 0.025%, p < 0.001). Conclusions Eidon provides more-balanced color images, with a wider richness of color content, compared to a conventional flash fundus camera. The overall higher chromaticity of Eidon may provide benefits in terms of discriminative power and diagnostic accuracy.

Narrow band red emitting europium complexes and their application in smart white LEDs and vapoluminescent sensors

2020 ◽  
Vol 49 (19) ◽  
pp. 6205-6219 ◽  
Author(s):  
Rachna Devi ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Narrow Band ◽  
White Led ◽  
Acid Base ◽  
Europium Complexes ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

The synthesized molecular Eu-complex based hybrid white LED showed superior color rendering index. In addition, the complex also showed on-off-on luminescence with exposure to acid–base vapours.

High color rendering index white LED based on nano-YAG:Ce3+phosphor hybrid with CdSe/CdS/ZnS core/shell/shell quantum dots

2012 ◽  
Vol 59 (14) ◽  
pp. 1199-1203 ◽  
Author(s):  
Changyu Shen ◽  
Jinlei Chu ◽  
Feng Qian ◽  
Xin Zou ◽  
Chuan Zhong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
White Led ◽  
Color Rendering Index ◽  
Color Rendering

scholarly journals Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

2021 ◽  
Author(s):  
Tianyuan Zhou ◽  
Chen Hou ◽  
Le Zhang ◽  
Yuelong Ma ◽  
Jian Kang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
White Led ◽  
Transparent Ceramics ◽  
Photoluminescence Excitation ◽  
Unilateral Shift ◽  
Excitation Mode ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

AbstractRealizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

Intense broad-band absorption and efficient blue-emitting SrCa2MgSi2O8:Eu2+ phosphor for high color-rendering white LED applications

2018 ◽  
Vol 8 (3) ◽  
pp. 254-262 ◽  
Author(s):  
Jy-Chern Chang ◽  
Haikun Liu ◽  
Pin-Chun Lin ◽  
Tzu-Jen Lin ◽  
Lufu Mei ◽  
...  
Keyword(s):  
Broad Band ◽  
White Led ◽  
Band Absorption ◽  
Color Rendering ◽  
Intense Broad Band
Sign in / Sign up

Export Citation Format

Share Document