scholarly journals Hydrothermal synthesis of narrow-band red emitting K2NaAlF6:Mn4+phosphor for warm-white LED applications

RSC Advances ◽  
2017 ◽  
Vol 7 (72) ◽  
pp. 45834-45842 ◽  
Author(s):  
Haiming Cheng ◽  
Yan Song ◽  
Guixia Liu ◽  
Dan Li ◽  
Xiangting Dong ◽  
...  
Keyword(s):  
Narrow Band ◽  
Red Light ◽  
Color Temperature ◽  
Light Radiation ◽  
White Led ◽  
Hydrothermal Route ◽  
Red Phosphor ◽  
Truncated Octahedron ◽  
Color Rendering Index ◽  
Color Rendering

The truncated octahedron shaped K2NaAlF6:Mn4+was preparedviahydrothermal route, which emits red light under blue light radiation. Warm WLEDs fabricated by the obtained red phosphor show lower color temperature and higher color rendering index.

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.

Study on Tunable Color Temperature White LED Light Source with Ultra-High Color Rendering Index

2015 ◽  
Vol 35 (10) ◽  
pp. 1023002
Author(s):  
谌江波 Chen Jiangbo ◽  
余建华 Yu Jianhua ◽  
高亚飞 Gao Yafei ◽  
张翼扬 Zhang Yiyang ◽  
陆秀炎 Lu Xiuyan
Keyword(s):  
Light Source ◽  
Color Temperature ◽  
White Led ◽  
Led Light ◽  
Color Rendering Index ◽  
Color Rendering

Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

CrystEngComm ◽  
2018 ◽  
Vol 20 (15) ◽  
pp. 2183-2192 ◽  
Author(s):  
Haiming Cheng ◽  
Yan Song ◽  
Feng Hong ◽  
Guixia Liu ◽  
Dan Li ◽  
...  
Keyword(s):  
Room Temperature ◽  
Narrow Band ◽  
Color Temperature ◽  
Temperature Synthesis ◽  
Red Phosphor ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Red Phosphors ◽  
White Light Emitting Diodes ◽  
Color Rendering

The white light-emitting diodes fabricated by mixing GaN chips with yellow phosphor (Y3Al5O12:Ce3+) and red phosphors (K2LiGaF6:Mn4+) exhibit good performance with lower color temperature and higher color rendering index.

scholarly journals Multi-functional semiconductor lighting

2020 ◽  
pp. 62-74
Author(s):  
Irina Palchikova ◽  
◽  
Elena Karamchuk ◽  
Evgenii Smirnov ◽  
Eugeny Palchikov ◽  
...  
Keyword(s):  
Experimental Model ◽  
Spectral Range ◽  
Digital Images ◽  
Color Temperature ◽  
White Led ◽  
Color Rendering Index ◽  
Multispectral Analysis ◽  
Color Rendering ◽  
Lighting Variation

Features of the development of the multifunctional semiconductor illuminators are discussed. The design and characteristics of the experimental model of the “Photobox 3138” illuminator are described. The lighting variation does not exceed 2 % at the edges of the working field of 300*300 mm. The design includes a white LED illuminator with a color temperature of 5000 K (CIE D50) and a high color rendering index (CRI 97+) and a set of six independently switched monochrome led illuminators in the spectral range from 365 to 880 nm. Digital images of objects obtained in “Photobox 3138” are of use to colorimetric, spectrozonal, and multispectral analysis.

A new single-component KCaY(PO4)2:Dy3+, Eu3+nanosized phosphor with high color-rendering index and excellent thermal resistance for warm-white NUV-LED

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 96263-96274 ◽  
Author(s):  
Xiao-Fei Wang ◽  
Qi Yang ◽  
Gui-Gen Wang ◽  
Xin-Zhong Wang ◽  
Jie-Cai Han
Keyword(s):  
Thermal Resistance ◽  
Single Component ◽  
Color Temperature ◽  
White Led ◽  
Color Rendering Index ◽  
Color Rendering

Single-component KCaY(PO4)2:Dy3+, Eu3+nanophosphor with high color-rendering index, low correlated color temperature and excellent thermal resistance for NUV-pumped warm-white LED.

Lanthanide organic–inorganic hybrids based on functionalized metal–organic frameworks (MOFs) for a near-UV white LED

2014 ◽  
Vol 50 (97) ◽  
pp. 15443-15446 ◽  
Author(s):  
Ye Lu ◽  
Bing Yan
Keyword(s):  
Quantum Yield ◽  
Hybrid Material ◽  
Metal Organic Frameworks ◽  
Color Temperature ◽  
White Led ◽  
High Quantum Yield ◽  
Inorganic Hybrid ◽  
Color Rendering Index ◽  
Metal Organic ◽  
Color Rendering

A novel near-UV white LED based on lanthanide organic–inorganic hybrid material is realized through postsynthetically modified MOFs and MOF-based polymers. The hybrids materials have high quantum yield and satisfactory luminescence stability; the assembled white LED has tuneable correlated color temperature and high color rendering index.

scholarly journals The study of convex-dual-layer remote phosphor geometry in upgrading WLEDs color rendering index

2021 ◽  
Vol 11 (5) ◽  
pp. 3890
Author(s):  
Huu Phuc Dang ◽  
Nguyen Thi Phuong Loan ◽  
Nguyen Thi Kim Chung ◽  
Nguyen Doan Quoc Anh
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Light Emitting Diode ◽  
Light Output ◽  
Color Temperature ◽  
Phosphor Layer ◽  
Red Phosphor ◽  
Remote Phosphor ◽  
Color Rendering Index ◽  
Color Rendering

<span>The white-light light-emitting diode (LED) is a semiconductor light source that usually has one chip and one phosphor layer. Because of that simple structure, the color rendering index (CRI) is really poor. Therefore, structure with double layer of phosphor and multiple chips has been studied with the phosphorus proportions and densities in the silicone are constantly changed to find the best option to improve optical properties. In research, we use red phosphor Ca5B2SiO10:Eu3+ layer to place above the yellow phosphor one, and both of them have a convex design. Then, the experiments and measurements are carried out to figure out the effects of this red phosphor as well as the convex-double-layer remote phosphor design on the LED’s performances. The measured results reveal that the light output is enhanced significantly when using convex-dual-layer structure instead of the single-layer design. Additionally, the Ca5B2SiO10:Eu3+ concentration benefits CRI and CQS at around 6600 K and 7700 K correlated color temperature (CCT). Yet, the lumen output shows a slight decline as this red phosphor concentration surpass 26% wt. Through the experiments, it is found that a double layer of chip and double phosphorus is the best structure which could support the quality of CRI and luminous flux.</span>

Rare earth-free high color rendering white light-emitting diodes using CsVO3 with highest quantum efficiency for vanadate phosphors

2015 ◽  
Vol 3 (41) ◽  
pp. 10748-10754 ◽  
Author(s):  
Tomohiko Nakajima ◽  
Masahiko Isobe ◽  
Yuko Uzawa ◽  
Tetsuo Tsuchiya
Keyword(s):  
Rare Earth ◽  
Quantum Efficiency ◽  
Internal Quantum Efficiency ◽  
White Led ◽  
Red Phosphor ◽  
Light Emitting ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Very High

Internal quantum efficiency of CsVO3 was considerably enhanced up to 95.8%, and a rare earth free white LED that had a very high color rendering index of 91.1 was realized by using CsVO3 and a deep red phosphor Mg2TiO4:Mn4+.

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