Temperature dependent optical properties of red emitting Na3GaF6:Mn4+ as a color converter for warm white LEDs

2018 ◽  
Vol 233 (7) ◽  
pp. 489-499 ◽  
Author(s):  
David Böhnisch ◽  
Thomas Jansen ◽  
Rainer Pöttgen ◽  
Thomas Jüstel
Keyword(s):  
Optical Properties ◽  
Calculated Data ◽  
Thermal Quenching ◽  
High Quantum Yield ◽  
Temperature Dependent ◽  
Red Phosphor ◽  
White Leds ◽  
Racah Parameters ◽  
Color Converter ◽  
Red Emitting Phosphor

Abstract This work presents and disentangles the temperature dependent optical properties of the red-emitting phosphor Na3GaF6:Mn4+. Moreover, crystal field and Racah parameters were investigated. It was proven that the material is suitable for the application in warm white LEDs due to its high quantum yield of about 83%, little thermal quenching of the photoluminescence up to 410 K, high lumen equivalent of about 220 lm/W, and strong absorption at 450 nm. In addition, different DFT approaches were used to investigate its band structure. The calculated data were compared to those obtained experimentally. Red phosphor spectra were calculated to evaluate the suitability of red line-emitting phosphors for the application in warm white emitting pcLEDs. Finally, warm white emitting LEDs comprising Na3GaF6:Mn4+ were constructed in order to show the potential of Na3GaF6:Mn4+ serving as a red component in phosphor blends for future warm white pcLEDs.

Novel La3GaGe5O16 : Mn4+based deep red phosphor: a potential color converter for warm white light

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90499-90507 ◽  
Author(s):  
Shaoan Zhang ◽  
Yihua Hu ◽  
He Duan ◽  
Li Chen ◽  
Yinrong Fu ◽  
...  
Keyword(s):  
Activation Energy ◽  
White Light ◽  
Thermal Quenching ◽  
Temperature Dependent ◽  
Quenching Temperature ◽  
Red Phosphor ◽  
Warm White Light ◽  
Relative Emission Intensity ◽  
Insight Into ◽  
Color Converter

We gained insight into the temperature-dependent relative emission intensity of La3GaGe5O16: Mn4+phosphor, and the luminescence quenching temperature and the activation energy for thermal quenching (ΔE) were obtained.

scholarly journals Synthesis, structure and optical performance of red-emitting phosphor Ba5AlF13:Mn4+

RSC Advances ◽  
2017 ◽  
Vol 7 (78) ◽  
pp. 49473-49479 ◽  
Author(s):  
Lin Qin ◽  
Peiqing Cai ◽  
Cuili Chen ◽  
Jing Wang ◽  
Hyo Jin Seo
Keyword(s):  
Thermal Quenching ◽  
Optical Performance ◽  
Red Phosphor ◽  
Red Emitting Phosphor

A novel Ba5AlF13:Mn4+red phosphor which shows significant anti-thermal quenching behavior.

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

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.

A red phosphor BaTiF6:Mn4+: reaction mechanism, microstructures, optical properties, and applications for white LEDs

2014 ◽  
Vol 43 (25) ◽  
pp. 9414-9418 ◽  
Author(s):  
Xianyu Jiang ◽  
Zhen Chen ◽  
Shaoming Huang ◽  
Jiaguo Wang ◽  
Yuexiao Pan
Keyword(s):  
Optical Properties ◽  
Reaction Mechanism ◽  
White Light ◽  
Red Phosphor ◽  
White Leds ◽  
Red Phosphors ◽  
Warm White Light ◽  
Color Rendering Index ◽  
Color Rendering

Red phosphors BaTiF6:Mn4+ were obtained by etching Ti(OC4H9)4 and TiO2 with BaF2 in HF and a KMnO4 solution. The WLED fabricated with BaTiF6:Mn4+ exhibits a “warm” white light with a color rendering index of 93.13.

Preparation and Optical Properties of Red Emitting Phosphor KLa(MoO4)2∶Eu3+for White LEDs

2013 ◽  
Vol 34 (8) ◽  
pp. 965-969
Author(s):  
侯利 HOU Li ◽  
吉日嘎兰图 Jirigalantu ◽  
齐向东 QI Xiang-dong ◽  
付作岭 FU Zuo-ling
Keyword(s):  
Optical Properties ◽  
White Leds ◽  
Red Emitting Phosphor

scholarly journals Influence of Ca[Mg3SiN4]Ce3+ phosphor’s concentration on optical properties of the 5600K RP-WLEDs

2020 ◽  
Vol 10 (2) ◽  
pp. 1273
Author(s):  
Phu Tran Tin ◽  
Minh Tran ◽  
Tran Thanh Trang
Keyword(s):  
Optical Properties ◽  
Phosphor Layer ◽  
Red Phosphor ◽  
Research Results ◽  
White Leds ◽  
New Material ◽  
Material Solution

In this paper, we propose Ca[Mg3SiN4]Ce3+ Phosphor as a new material solution for improving the optical properties in terms of CRI, CQS. D-CCT, LO of the 5600K remote-packaging white LEDs (RP-WLEDs). In the first stage, we built and investigated the 5600K RP-WLEDs by adding the red phosphor to the phosphor layer. Then, the scattering processes inside the phosphor layer are investigated by Mat Lab software. From the research results, we discovered that the concentration of the adding phosphor significantly improved the optical properties of the5600K RP-WLEDs. All the results are convinced by Light Tools and Mat Lab software.

A novel red phosphor Ba2La4Y4(SiO4)6O2:Eu3+ with high quantum yield and thermal stability for warm white LEDs

2019 ◽  
Vol 789 ◽  
pp. 381-391 ◽  
Author(s):  
Sanhai Wang ◽  
Yanqiao Xu ◽  
Ting Chen ◽  
Weihui Jiang ◽  
Jianmin Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Yield ◽  
High Quantum Yield ◽  
Red Phosphor ◽  
White Leds ◽  
High Quantum

New Red-Emitting Phosphor La2Zr3(MoO4)9:Eu3+ and the Influence of Host Absorption on its Luminescence Efficiency

2015 ◽  
Vol 68 (11) ◽  
pp. 1727 ◽  
Author(s):  
Florian Baur ◽  
Thomas Jüstel
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Absorption Band ◽  
Emission Spectra ◽  
Temperature Dependent ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Transfer Processes ◽  
Luminescence Efficiency ◽  
Red Emitting Phosphor

This work investigates the optical properties of Eu3+-activated La2Zr3(MoO4)9. A series of solid solutions with Eu3+ concentrations in the range of 0–100 % were prepared by conventional high temperature solid-state synthesis. An unusual change in the lattice parameters was observed. The phosphor exhibits a broad absorption band in the UV spectral region, and measurements on the non-doped material at 100 K were conducted to elucidate the nature of the absorption band. As demonstrated, Mo6+ charge transfer absorption negatively influences the luminescence efficiency of the phosphor. The temperature-dependent emission spectra revealed that the emission intensity exhibits a bi-sigmoidal temperature dependence. This behaviour results from competing absorption via Mo6+ charge transfer processes, which strongly decrease the efficiency of the phosphor. For application purposes, it is therefore advisable to choose materials that do not exhibit host absorption in the spectral range where excitation is expected.

Sign in / Sign up

Export Citation Format

Share Document