Narrow band red emitting phosphor with negligible concentration quenching for hybrid white LEDs and plant growth applications

2021 ◽  
Author(s):  
Kasturi Singh ◽  
R. Marikumar ◽  
Rachna Devi ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Plant Growth ◽  
Narrow Band ◽  
Concentration Quenching ◽  
White Led ◽  
White Leds ◽  
Red Emitting Phosphor

¬Narrow band red emitters is the key to solve the problem encountered by the current white LED technology. In this context, a series of new red emitting Li3BaSrLa3¬(MoO4)8:Eu3+ phosphors were...

Zero-concentration quenching: a novel Eu3+ based red phosphor with non-layered crystal structure for white LEDs and NaSrY(MoO4)3:Sm3+ based deep-red LEDs for plant growth

2020 ◽  
Vol 49 (27) ◽  
pp. 9239-9253 ◽  
Author(s):  
Marikumar Rajendran ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Crystal Structure ◽  
Plant Growth ◽  
Narrow Band ◽  
Concentration Quenching ◽  
Layered Crystal ◽  
White Led ◽  
Red Phosphor ◽  
White Leds ◽  
Layered Crystal Structure ◽  
Red Leds

Oxide based highly efficient narrow band red emitting phosphors are still a bottleneck in white LED applications.

Narrow-band red emitting phosphor BaTiF6:Mn4+: preparation, characterization and application for warm white LED devices

2016 ◽  
Vol 45 (44) ◽  
pp. 17886-17895 ◽  
Author(s):  
Xiaoli Gao ◽  
Yan Song ◽  
Guixia Liu ◽  
Xiangting Dong ◽  
Jinxian Wang ◽  
...  
Keyword(s):  
Narrow Band ◽  
White Led ◽  
White Leds ◽  
Blue Chip ◽  
Red Emitting Phosphor

A narrow-band red emitting BaTiF6:Mn4+phosphor with a microspindle morphology is applied to warm white LEDs by combination with a blue chip and YAG:Ce3+.

Synthesis and warm-white LED applications of an efficient narrow-band red emitting phosphor, Rb2ZrF6:Mn4+

2017 ◽  
Vol 5 (29) ◽  
pp. 7253-7261 ◽  
Author(s):  
L. Y. Wang ◽  
E. H. Song ◽  
Y. Y. Zhou ◽  
T. T. Deng ◽  
S. Ye ◽  
...  
Keyword(s):  
Narrow Band ◽  
Precipitation Method ◽  
White Led ◽  
Red Phosphor ◽  
Yellow Phosphor ◽  
Co Precipitation ◽  
Red Emitting Phosphor

Phosphor Rb2ZrF6:Mn4+has been synthesizedviaa co-precipitation method. Series of WLEDs were fabricated by combining YAG:Ce3+yellow phosphor and different amount of Rb2ZrF6:Mn4+red phosphor with InGaN blue chips.

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.

Efficient and ultra-thermally stable Eu3+ and Sm3+ activated narrow band red/deep red emitting phosphors and their versatile applications

2021 ◽  
Author(s):  
Priyadarshini Pradhan ◽  
Savita Priya ◽  
R. Marikumar ◽  
Kasturi Singh ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Optical Properties ◽  
Plant Growth ◽  
Narrow Band ◽  
White Led ◽  
Thermally Stable ◽  
Latent Fingerprint ◽  
Red Phosphors

A succession of Eu3+ activated Na2Y4(WO4)7 (NYW) red phosphors were synthesised and studied their optical properties in details for white LED, latent fingerprint and plant growth applications. The phosphors crystallised...

scholarly journals STUDYING NARROW-BAND BLUE LIGHT FILTER FOR WHITE LEDS

2019 ◽  
Vol 8 ◽  
pp. 244-253
Author(s):  
Nadezhda Chayka ◽  
Danila Semenov
Keyword(s):  
Blue Light ◽  
Narrow Band ◽  
Optical Filter ◽  
Light Filter ◽  
White Led ◽  
White Leds ◽  
Human Eye ◽  
Blue Light Filter

In this paper, we investigated the properties of the developed optical filter, that cuts off part of the blue light range in the spectrum of a white LED, which is harmful to the human eye. The developed filter allows reflecting up to 30 % of blue light in the range from 435 to 440 nm.

scholarly journals A STUDY OF RED-EMITTING PHOSPHOR OF K2SiF6:Mn4+ FOR WARM WHITE LEDs

2018 ◽  
Vol 56 (1A) ◽  
pp. 183 ◽  
Author(s):  
Nguyen Le Anh
Keyword(s):  
Energy Transfer ◽  
Narrow Band ◽  
Light Emitting Diode ◽  
Forbidden States ◽  
Red Emission ◽  
Light Emitting ◽  
White Leds ◽  
Band Emission ◽  
Red Emitting Phosphor

This study focuses on the fabrication of red-emitting phosphor based on K2SiF6: Mn4+ phosphor. Characteristic emissive peaks in the red region of the Mn4+ ions involve the energy transfer from spin-forbidden states of 2Eg → 4A2, showing narrow band emission peaks at 609, 614, 631, 635 and 647 nm. Meanwhile, their absorptive peaks involve the energy transfer from spin-allowed states of 4A2 → 4Tg; the excited wavelength of the Mn4+ is in the range 360 - 460 nm. Thus, the K2SiF6: Mn4+ phosphor is particularly suitable for redundancy of 460 nm - Light Emitting Diode (LED); it complements the red emission of the commercial White LEDs.

Systematic investigation of Eu3+ activated Na2Ln4(MoO4)7 [Ln = La, Gd and Y] narrow band red emitting phosphors for hybrid white LEDs and plant growth

2020 ◽  
Vol 44 (35) ◽  
pp. 14823-14836 ◽  
Author(s):  
Marikumar Rajendran ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Solid State ◽  
Plant Growth ◽  
Narrow Band ◽  
Systematic Investigation ◽  
Solid State Method ◽  
White Leds ◽  
Red Phosphors ◽  
Conventional Solid State Method ◽  
State Method

A sequence of Eu3+ activated Na2Ln4(MoO4)7 [Ln = La, Gd and Y] red phosphors has been synthesized using a conventional solid-state method.

An efficient and stable narrow band Mn4+-activated fluorotitanate red phosphor Rb2TiF6:Mn4+ for warm white LED applications

2018 ◽  
Vol 6 (32) ◽  
pp. 8670-8678 ◽  
Author(s):  
L. Y. Wang ◽  
E. H. Song ◽  
Y. Y. Zhou ◽  
T. T. Deng ◽  
S. Ye ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Working Conditions ◽  
Narrow Band ◽  
Internal Quantum Efficiency ◽  
Luminescence Properties ◽  
White Led ◽  
Red Phosphor ◽  
Red Emitting Phosphor

A Rb-based fluorotitanate red-emitting phosphor Rb2TiF6:MnM4+ with an internal quantum efficiency of 91% was synthesized and presents exceptional luminescence properties, thermal stability and longevity under LED working conditions.

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