New Developments in the Field of Luminescent Materials for Lighting and Displays

Jüstel, Thomas; Nikol, Hans; Ronda, Cees

doi:10.1002/(sici)1521-3773(19981204)37:22<3084::aid-anie3084>3.0.co;2-w

Cited by 1,270 publications

(688 citation statements)

References 35 publications

Supporting

Mentioning

654

Contrasting

Unclassified

Order By: Relevance

“…The phosphor is a crucial component, impacting the overall luminous efficacy, color temperature, color rendition, and thermal stability of the resulting white light. [3][4][5] The most appropriate phosphors for this application usually involve the broad and symmetry-allowed 4f to 5d transitions in Ce 3+ or Eu 2+ substituted in a host matrix such as an oxide, oxyfluoride, nitride, or oxynitride. 5 The energies associated with these transitions are strongly influenced by the crystal field splitting of the 5d levels due to the surrounding host structure.…”

Section: Introductionmentioning

confidence: 99%

Average and Local Structure, Debye Temperature, and Structural Rigidity in Some Oxide Compounds Related to Phosphor Hosts

Denault

Brgoch

Kloß

et al. 2015

ACS Appl. Mater. Interfaces

175

121

View full text Add to dashboard Cite

The average and local structure of the oxides Ba2SiO4, BaAl2O4, SrAl2O4, and Y2SiO5 are examined to evaluate crystal rigidity in light of recent studies suggesting that highly connected and rigid structures yield the best phosphor hosts. Simultaneous momentum-space refinements of synchrotron X-ray and neutron scattering yield accurate average crystal structures, with reliable atomic displacement parameters. The Debye temperature ΘD, which has proven to be a useful proxy for structural rigidity, is extracted from the experimental atomic displacement parameters and compared with predictions from density functional theory calculations and experimental low-temperature heat capacity measurements. The role of static disorder on the measured displacement parameters, and the resulting Debye temperatures, are also analyzed using pair distribution function of total neutron scattering, as refined over varying distance ranges of the pair distribution function. The interplay between optimal bonding in the structure, structural rigidity, and correlated motion in these structures is examined, and the different contributions are delineated.

show abstract

Section: Introductionmentioning

confidence: 99%

Average and Local Structure, Debye Temperature, and Structural Rigidity in Some Oxide Compounds Related to Phosphor Hosts

Denault

Brgoch

Kloß

et al. 2015

ACS Appl. Mater. Interfaces

175

121

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5] The application relevance of this issue is related to the functioning of lanthanide ions in light emitting diodes (LED) in order to generate domestic lighting. Nowadays, the ban on the incandescent light bulbs being effective, artificial white light source is, for instance, obtained by the combination of a gallium nitride blue LED with an inorganic phosphor, i.e.…”

Section: Introductionmentioning

confidence: 99%

Ligand field density functional theory for the prediction of future domestic lighting

Ramanantoanina

Urland

García‐Fuente

et al. 2014

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We deal with the computational determination of the electronic structure and properties of lanthanide ions in complexes and extended structures having open-shell f and d configurations. Particularly, we present conceptual and methodological issues based on Density Functional Theory (DFT) enabling the reliable calculation and description of the f -d transitions in lanthanide doped phosphors. We consider here the optical properties of the Pr 3+ ion embedded into various solid state fluoride host lattices, for the prospection and understanding of the so-called quantum cutting process, being important in the further quest of warm-white light source in light emitting diodes (LED). We use the conceptual formulation of the revisited ligand field (LF) theory, fully compatibilized with the quantum chemistry tools: LFDFT. We present methodological advances for the calculations of the Slater-Condon parameters, the ligand field interaction and the spin-orbit coupling constants, important in the non-empirical parameterization of the effective Hamiltonian adjusted from the ligand field theory. The model shows simple procedure using less sophisticated computational tools, which is intended to contribute to the design of modern phosphors and to help to complement the understanding of the 4f n -4f nÀ1 5d 1 transitions in any lanthanide system.

show abstract

“…The collected data from previously measured luminescence spectra of Ce 3? -doped (Gd,Y,Lu) 3 (Al,Ga) 5 O 12 by Dorenbos [39] indicate that the blue-/red-shift effect is mainly attributed to the splitting energy D 12 instead of Dq, cf. Fig.…”

Section: Case Studiesmentioning

confidence: 99%

“…The invention of bright-blue LEDs (light emitting diodes) by Nakamura and others in the mid-1990s [2,3] has led to the development of devices capable to produce white light in a reliable and efficient way, based on inorganic phosphors [4]. Presently, pcLED (phosphor converted light emitting diode) lamps are characterized by a number of important advantages compared to older generations of lamps, as they contain no highly toxic mercury [5], turn on instantly, are mechanically robust, have a longer life expectancy (up to 25,000-30,000 h) and especially have a higher energetic efficiency. In principle, white light could be obtained by combining the three fundamental colors (red, green, and blue, RGB) generated by three distinct LEDs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inorganic Phosphor Materials for Lighting

2016

View full text Add to dashboard Cite

This chapter addresses the development of inorganic phosphor materials capable of converting the near UV or blue radiation emitted by a light emitting diode to visible radiation that can be suitably combined to yield white light. These materials are at the core of the new generation of solid-state lighting devices that are emerging as a crucial clean and energy saving technology. The chapter introduces the problem of white light generation using inorganic phosphors and the structureproperty relationships in the broad class of phosphor materials, normally containing lanthanide or transition metal ions as dopants. Radiative and non-radiative relaxation mechanisms are briefly described. Phosphors emitting light of different colors (yellow, blue, green, and red) are described and reviewed, classifying them in different chemical families of the host (silicates, phosphates, aluminates, borates, and non-oxide hosts). This research field has grown rapidly and is still growing, but the discovery of new phosphor materials with optimized properties (in terms of emission efficiency, chemical and thermal stability, color, purity, and cost of fabrication) would still be of the utmost importance.

show abstract

New Developments in the Field of Luminescent Materials for Lighting and Displays

Cited by 1,270 publications

References 35 publications

Average and Local Structure, Debye Temperature, and Structural Rigidity in Some Oxide Compounds Related to Phosphor Hosts

Average and Local Structure, Debye Temperature, and Structural Rigidity in Some Oxide Compounds Related to Phosphor Hosts

Ligand field density functional theory for the prediction of future domestic lighting

Inorganic Phosphor Materials for Lighting

Contact Info

Product

Resources

About