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.

Red-emitting phosphors APF6:Mn4+ (A = Cs+, Rb+, K+): synthesis, luminescence properties and application in solid-state lighting

2019 ◽  
Vol 48 (29) ◽  
pp. 10901-10906 ◽  
Author(s):  
Yu Chen ◽  
Zhaofeng Yang ◽  
Qin Wang ◽  
Meizhu Rong ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Thermal Quenching ◽  
Solid State Lighting ◽  
Luminescence Properties ◽  
Red Emission ◽  
White Leds

New red-emitting phosphors APF6:Mn4+ (A = Cs+, Rb+, K+) show intense red emission with high external quantum efficiency and thermal quenching resistance for warm white LEDs.

scholarly journals High homogeneity, thermal stability and external quantum efficiency of Ce:YAG single-crystal powder phosphors for white LEDs

2016 ◽  
Vol 124 (5) ◽  
pp. 574-578 ◽  
Author(s):  
Stelian ARJOCA ◽  
Encarnación G. VÍLLORA ◽  
Daisuke INOMATA ◽  
Yusuke ARAI ◽  
Yujin CHO ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Crystal ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
White Leds ◽  
High Homogeneity

scholarly journals Novel Eu3+-activated Ba2Y5B5O17 red-emitting phosphors for white LEDs: high color purity, high quantum efficiency and excellent thermal stability

RSC Advances ◽  
2018 ◽  
Vol 8 (41) ◽  
pp. 23323-23331 ◽  
Author(s):  
G. Annadurai ◽  
Balaji Devakumar ◽  
Heng Guo ◽  
R. Vijayakumar ◽  
Bin Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Color Purity ◽  
High Quantum Efficiency ◽  
Excellent Thermal Stability ◽  
White Leds ◽  
High Quantum ◽  
High Color Purity ◽  
Red Emitting Phosphor

A novel Ba2Y5B5O17:Eu3+ red-emitting phosphor with high color purity, high quantum efficiency and excellent thermal stability was developed.

Highly efficient near-UV-excitable Ca2YHf2Al3O12:Ce3+,Tb3+ green-emitting garnet phosphors with potential application in high color rendering warm-white LEDs

2020 ◽  
Vol 8 (13) ◽  
pp. 4408-4420 ◽  
Author(s):  
Shaoying Wang ◽  
Balaji Devakumar ◽  
Qi Sun ◽  
Jia Liang ◽  
Liangling Sun ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Potential Application ◽  
Internal Quantum Efficiency ◽  
White Leds ◽  
Highly Efficient ◽  
Color Rendering

Novel near-UV-excitable Ca2YHf2Al3O12:Ce3+,Tb3+ green phosphors with a highest internal quantum efficiency of 86.6% and external quantum efficiency of 63.1% were reported for high-CRI warm-white LEDs.

Synthesis of Sr2Si5N8:Eu2+ Phosphor for Enhanced Red Emission

2011 ◽  
Vol 233-235 ◽  
pp. 2705-2709 ◽  
Author(s):  
Van Duong Luong ◽  
Wen Tao Zhang ◽  
Hong Ro Lee
Keyword(s):  
Single Phase ◽  
Luminescence Properties ◽  
Heating Process ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Red Emission ◽  
Light Emitting ◽  
White Leds ◽  
Xrd Patterns ◽  
White Light Emitting Diodes

For removing impurities to improve luminescence properties, Eu2+- activated Sr2Si5N8 red phosphor for white light-emitting diodes (LEDs) was prepared by multiple heat-treatment synthesis which includes carbothermal reduction and nitridation. The X-ray diffraction (XRD) patterns were showed the standard single phase of Sr2Si5N8. With an optimized amount of Eu2+ (2 at. %) dopant, the broad excitation band of Sr2Si5N8:Eu2+ indicated that the phosphor was suitable for application of white LEDs with UV or blue chip, and red emission peak at 628 nm in spectra originating from the 4f65d1→4f7 transition of Eu2+ ion. After third heating process, luminescence properties of the obtained phosphor were improved obviously and higher than commercial YAG:Ce3+ phosphor.

Synthesis and luminescence properties of Zn3B2O6:Eu3+, Li+ red-emitting phosphor for white LEDs

2018 ◽  
Vol 528 (1) ◽  
pp. 114-121 ◽  
Author(s):  
Dongsheng Zhou ◽  
Guilin Yan ◽  
Wentao Zhang ◽  
Jinhui Lin ◽  
Kehui Qiu
Keyword(s):  
Luminescence Properties ◽  
White Leds ◽  
Red Emitting Phosphor

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.

Red Phosphorescent Platinum(II) Complexes with Tetradentate Pyridine-Containing Ligands for Organic Light Emitting Diodes

2020 ◽  
Vol 20 (11) ◽  
pp. 6669-6674
Author(s):  
Jeongkyu Woo ◽  
Soo Kyung Kang ◽  
Ju Hee Han ◽  
Ki Ju Kim ◽  
Yu Ji Moon ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Red Emission ◽  
Light Emitting ◽  
Organic Light ◽  
20 Nm

Here, red phosphorescent platinum(II) complexes based on tetradentate pyridine-containing lig-ands are studied. To investigate their electroluminescent properties, multilayer devices were fabricated in the following sequence; ITO (180 nm)/4,4′,4″-Tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA) (30 nm)/N, N′-di(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl)4,4′-diamine (NPB) (20 nm)/ Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) (10 nm)/4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) (20 nm)/Platinum(II) complex (20 nm)/1,3,5-Tris(1-Phenyl-1H-benzimidazol-2-yl)benzene) (TPBi) (40 nm)/Liq (2 nm)/Al (100 nm). In particularly, a device using platinum(II) complex based on N-(3,5-di-tert-butylphenyl)-3-(pyridin-2-yl)-N-(3-(pyridin-2-yl)phenyl)benzenamineligand showed the efficient red emission, with a luminous efficiency, power efficiency, and external quantum efficiency of, and the Commission International de LEclairge (CIE) coordinates of 27.26 cd/A, 10.54 lm/W, 8.50% at 20 mA/cm2, and (0.65, 0.33) at 11.0 V, respectively.

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