High Efficiency Green Phosphor Ba9Lu2Si6O24:Tb3+: Visible Quantum Cutting via Cross-Relaxation Energy Transfers

2016 ◽  
Vol 120 (4) ◽  
pp. 2362-2370 ◽  
Author(s):  
Yongfu Liu ◽  
Jianxin Zhang ◽  
Changhua Zhang ◽  
Jun Jiang ◽  
Haochuan Jiang
Keyword(s):  
High Efficiency ◽  
Cross Relaxation ◽  
Relaxation Energy ◽  
Green Phosphor ◽  
Energy Transfers ◽  
Quantum Cutting

Thulium Doped Phosphors Under VUV Excitation

2008 ◽  
Vol 1111 ◽  
Author(s):  
Bernard Moine ◽  
Léna Beauzamy ◽  
Richard S. Meltzer
Keyword(s):  
Excited States ◽  
High Efficiency ◽  
Emission Spectra ◽  
Quantum Yields ◽  
Relaxation Energy ◽  
Fluorescent Lamps ◽  
Emission Lifetime ◽  
Plasma Display ◽  
Quantum Cutting ◽  
Single Material

AbstractDevelopment of highly efficient mercury free fluorescent lamps and plasma display panels has been a challenging task due to the need for a combination of phosphor properties that are difficult to obtain in a single material (high efficiency, short emission lifetime and weak sensitivity to aging process under VUV excitation). Quantum cutting mechanism is a way to improve the fluorescence efficacy. Here we describe quantum cutting involving pairs of Tm3+ ions in KY3F10. Efficient excitation in the vacuum UV is initiated to the 5d state of Tm3+. This is followed by a cross relaxation energy transfer (CRET) involving the excited ion in the 5d state and nearby Tm3+ in the ground state, producing a pair of Tm3+ in excited states of the 4f13 configuration. Both ions can then emit photons. The excitation and reflection spectra are studied as a function of Tm3+ concentration and temperature. An unusual enhancement of the reflectivity at excitation wavelengths corresponding to the Tm3+ 5d absorption peaks is shown to arise from strong 5d→4f emission which is confirmed from the VUV emission spectra. The strong reduction of the integrated 5d emission intensity and shortening of its lifetime with Tm3+ concentration indicates the effective presence of the desired CRET process that is required for the first step of the quantum cutting. High Tm3+ concentrations are required for efficient quantum cutting. Whereas the CRET from the 5d state is estimated to be quite efficient, the 4f13 states of Tm3+ also undergo a strong CRET and therefore, emission from the 4f13 excited states that are created from the first step are strongly quenched at high Tm3+ concentrations. As a result, quantum yields greater than unity are not achieved.

Aluminate Green Phosphor with Small Particle Size Used for PDP via Co-Precipitation Method

2011 ◽  
Vol 295-297 ◽  
pp. 890-895
Author(s):  
Yan Dong ◽  
Yang Zhou ◽  
Xue Lin Han ◽  
Wei Jie Gu
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Small Particle ◽  
High Efficiency ◽  
Particle Growth ◽  
Solid State Reaction Method ◽  
Precipitation Method ◽  
Small Particle Size ◽  
Green Phosphor ◽  
Co Precipitation

Mg doped BaAl12O19:Mn2+ phosphor is one of the most efficient green phosphors for PDP. It is difficult to prepare the phosphor both have small particle size (< 3μm) and high luminescence. In the present work, a BaAl12O19:Mn2+ phosphor with small particle size was synthesized by the chemical co-precipitation method. Phase transformation and particle growth process during calcining process were investigated. The nucleation process was also discussed. The results show that, the phase transformation is complicated, the transition phases include BaCO3, γ-Al2O3, BaF2, BaAl2O4 and two phases contain Mn; The BaAl12O19 phase is formed from the reaction between BaAl2O4 phase and γ-Al2O3 phase, no a-Al2O3 phase appears during the entire process; The formation temperature of pure BaAl12O19 phase is 1200°C, which is lower than that in the high-temperature solid state reaction method. High efficiency BaAl12O19:Mn2+ phosphor with small particle size (< 2μm) and hexagonal flaky shape can be prepared by this method.

Cross-relaxation energy transfer between the Er3+ ions in vitreous arsenic chalcogenide

2019 ◽  
Vol 33 (28) ◽  
pp. 1950348
Author(s):  
S. Q. Asadullayeva ◽  
Q. Y. Eyyubov
Keyword(s):  
Energy Transfer ◽  
Relaxation Process ◽  
Luminescence Intensity ◽  
Near Infrared ◽  
Cross Relaxation ◽  
Relaxation Energy ◽  
Infrared Luminescence ◽  
Cross Relaxation Process ◽  
The Cross ◽  
Activator Ions

In this paper, we study widely investigated photoluminescent properties of [Formula: see text] compounds in the near-infrared ranges. The increase of the infrared luminescence intensity with increasing [Formula: see text] concentration can be attributed to the cross-relaxation process between the activator ions.

Cross-relaxation energy transfer in Tm3+doped tellurite glass

2005 ◽  
Author(s):  
Jianfeng Wu ◽  
Shibin Jiang ◽  
Tiequn Qiu ◽  
Michael Morrell ◽  
Axel Schulzgen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Tellurite Glass ◽  
Cross Relaxation ◽  
Relaxation Energy

scholarly journals Near-infrared quantum cutting in Ho3+, Yb3+-codoped BaGdF5 nanoparticles via first- and second-order energy transfers

2012 ◽  
Vol 7 (1) ◽  
pp. 636 ◽  
Author(s):  
Linna Guo ◽  
Yuhua Wang ◽  
Jia Zhang ◽  
Yanzhao Wang ◽  
Pengyu Dong
Keyword(s):  
Near Infrared ◽  
Second Order ◽  
Order Energy ◽  
Energy Transfers ◽  
Quantum Cutting

Detailed-balance analysis of Yb3+:CsPb(Cl1−xBrx)3 quantum-cutting layers for high-efficiency photovoltaics under real-world conditions

2019 ◽  
Vol 12 (8) ◽  
pp. 2486-2495 ◽  
Author(s):  
Matthew J. Crane ◽  
Daniel M. Kroupa ◽  
Daniel R. Gamelin
Keyword(s):  
Experimental Data ◽  
Power Generation ◽  
Real World ◽  
High Efficiency ◽  
Detailed Balance ◽  
Photovoltaic Devices ◽  
Balance Analysis ◽  
Quantum Cutting

Detailed-balance calculations based on experimental data show that quantum-cutting Yb3+:CsPb(Cl1-xBrx)3 can boost annual power generation from photovoltaic devices by over 20% in real-world conditions, rivaling perovskite-on-silicon tandem photovoltaics.

scholarly journals Novel approach towards cross-relaxation energy transfer calculation applied on highly thulium doped tellurite glasses

2011 ◽  
Vol 19 (27) ◽  
pp. 26269 ◽  
Author(s):  
Masaud Taher ◽  
Hrvoje Gebavi ◽  
Stefano Taccheo ◽  
Daniel Milanese ◽  
Rolindes Balda
Keyword(s):  
Energy Transfer ◽  
Cross Relaxation ◽  
Tellurite Glasses ◽  
Relaxation Energy ◽  
Novel Approach

Cooperative Energy Transfer of Er-Gd-Tb System in Tb3+, Er3+ Co-Doped K2GdZr(PO4)3 as a Potential Visible Quantum Cutting Phosphor

2014 ◽  
Vol 936 ◽  
pp. 585-590 ◽  
Author(s):  
Liang Feng Niu ◽  
Wei Liang ◽  
Chang Zeng Wu ◽  
Yu Hua Wang
Keyword(s):  
Energy Transfer ◽  
Ultra Violet ◽  
Solid State Reaction Method ◽  
Practical Application ◽  
Energy Transfers ◽  
Quantum Cutting ◽  
Down Conversion ◽  
Vacuum Ultra Violet ◽  
Co Doped ◽  
Cooperative Energy

Tb3+, Er3+co-doped K2GdZr (PO4)3samples were prepared by solid-state reaction method and their photoluminescence (PL) properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The results indicate that the energy transfers from Er3+to Gd3+and from Gd3+to Tb3+required for occurring of visible quantum cutting through down-conversion are efficient. In this cooperative energy transfer process, Gd3+is used as an intermediate of energy transfer between Er3+and Tb3+. The optimal quantum efficiency (QE) of this co-doped system K2GdZr (PO4)3: Er3+, Tb3+phosphor reached to 110%, suggesting a potential visible quantum cutting phosphor in practical application.

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