A facile two-step synthesis of an efficient narrow-band red-emitting K2NbF7:Mn4+ phosphor for warm white LEDs and its thermal quenching behavior

We report the development of new nanoparticle phosphors and quantum dot structures designed for applications to enhance the color rendering and efficiency of high brightness white LEDs, as well as for bio-sensing applications. The intrinsic problem of self-absorption, high toxicity, and high sensitivity to thermal quenching of conventional quantum dot systems has prevented their adoption to LED devices. Doped Cd-free quantum dots may circumvent these issues due to their distinct Stokes shift and improved stability at high temperature. We report on the modification of Mn-doped ZnSe/ZnS core-shell quantum dots for application to the (blue diode + yellow emitter) white LED system. Band gap tuning for 460 nm excitation, inorganic shell growth and in-situ monitoring for enhanced efficiency, and analysis of thermal stability will are reported.

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BaY1·95Al2Ga2SiO12:0.05Ce3+: A novel green-emitting phosphor with extra-high quantum yield, small thermal quenching and excellent water resistance for high-color-rendering white LEDs

Journal of Luminescence ◽

10.1016/j.jlumin.2020.117293 ◽

2020 ◽

Vol 224 ◽

pp. 117293 ◽

Cited By ~ 1

Author(s):

Yaochun Qiang ◽

Yanan Liu ◽

Jiayuan Chen ◽

Shaopeng Liu ◽

Lulu Zhang ◽

...

Keyword(s):

Quantum Yield ◽

Water Resistance ◽

Thermal Quenching ◽

High Quantum Yield ◽

White Leds ◽

High Quantum ◽

Color Rendering

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Luminescence properties of Mn4+ with high 2Eg level energy in the polyfluoride Na3Li3Sc2F12

Dalton Transactions ◽

10.1039/d0dt02389b ◽

2020 ◽

Vol 49 (33) ◽

pp. 11613-11617

Author(s):

Hong Li ◽

Yan Liu ◽

Shu Tang ◽

Lijun Luo ◽

Qiang Zhou ◽

...

Keyword(s):

Quantum Efficiency ◽

External Quantum Efficiency ◽

Thermal Quenching ◽

Luminescence Properties ◽

Level Energy ◽

Red Emission ◽

White Leds ◽

Red Emitting Phosphor

Red-emitting phosphor Na3Li3Sc2F12:Mn4+ with the high 2Eg level energy shows intensive red emission accompanied with the high external quantum efficiency and thermal-quenching resistance for warm white LEDs.

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A narrow-band blue emitting phosphor Ca8Mg7Si9N22:Eu2+ for pc-LEDs

Journal of Materials Chemistry C ◽

10.1039/c9tc00855a ◽

2019 ◽

Vol 7 (13) ◽

pp. 3730-3734 ◽

Cited By ~ 12

Author(s):

Chao Li ◽

Xiao-Ming Wang ◽

Feng-Feng Chi ◽

Zu-Pei Yang ◽

Huan Jiao

Keyword(s):

Emission Intensity ◽

Room Temperature ◽

Narrow Band ◽

Blue Emission ◽

Thermal Quenching ◽

Unit Cell ◽

Photoluminescence Emission ◽

Space Group

Ca8Mg7Si9N22 crystallizes in a tetragonal space group P42/nmc (No. 137) with a unit cell of a = 7.3271(11) Å and c = 10.336(2) Å. Ca8Mg7Si9N22:Eu2+ shows a narrow-band blue emission peaking at 400 nm with an intriguing bandwidth ∼34 nm and shows remarkably high thermal quenching resistance, maintaining 92% photoluminescence emission intensity at 420 K and 75% at 700 K of that measured at room temperature.

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

Dalton Transactions ◽

10.1039/d0dt00519c ◽

2020 ◽

Vol 49 (19) ◽

pp. 6205-6219 ◽

Cited By ~ 9

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.

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Synthesis of narrow-band red-emitting K2SiF6:Mn4+ phosphors for a deep red monochromatic LED and ultrahigh color quality warm-white LEDs

Journal of Materials Chemistry C ◽

10.1039/c4tc02042a ◽

2015 ◽

Vol 3 (3) ◽

pp. 607-615 ◽

Cited By ~ 111

Author(s):

Ji Hye Oh ◽

Heejoon Kang ◽

Yun Jae Eo ◽

Hoo Keun Park ◽

Young Rag Do

Keyword(s):

White Light ◽

Light Emitting Diodes ◽

Narrow Band ◽

Light Emitting ◽

White Leds ◽

Color Quality ◽

Warm White Light ◽

White Light Emitting Diodes

In this study, we synthesized and characterized narrow-band red-emitting K2SiF6:Mn4+ phosphors in order to improve the color qualities of warm white light-emitting diodes (LEDs).

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