Cascade fluorescent decay in Pr3+-doped fluorides: Achievement of a quantum yield greater than unity for emission of visible light

Piper, W. W.; DeLuca, J. A.; Ham, Frank S.

doi:10.1016/0022-2313(74)90007-6

Cited by 382 publications

(184 citation statements)

References 9 publications

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“…A two-step resonant energy-transfer process starting from the 6 G level of Gd 3+ results in the emission of two visible (red) photons emitted by two Eu 3+ ions [3]. An alternative quantum cutting process involves a cascade emission from the 1 S 0 level of Pr 3+ [7,8]. Albeit efficient, the photon emitted in the first step has a wavelength around 405 nm which is not favorable for lighting applications.…”

Section: Vacuum Ultraviolet Spectroscopy and Quantum Cuttingmentioning

confidence: 99%

Photon management with lanthanides

et al. 2006

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Efficient conversion of photons from high energy radiation (e.g. ultraviolet or X-rays) to lower energies (visible) has been optimized by using luminescent materials based on the optical properties of lanthanide ions. Presently, luminescent materials with efficiencies close to the theoretical maximum are applied in e.g. fluorescent tubes, X-ray imaging and color television. Contrary to the mature status of luminescent materials in these fields, areas requiring new luminescent materials are emerging. There is great challenge in research on upand downconversion materials and lanthanide ions are the prime candidates to achieve efficient materials. Here downconversion processes will be discussed for VUV phosphors with Pr 3+ . The efficiency of resonant energy transfer of the 1 S 0 -1 I 6 energy from Pr 3+ to Eu 3+ and Mn 2+ is investigated. The aim is to convert the 405 nm photon of the first step of the well-known cascade emission of Pr 3+ into a more useful visible photon. For co-doping with Eu 3+ it is observed that the Pr 3+ emission is quenched, most probably through a metal-to-metal charge-transfer state. The energy transfer from Pr 3+ to Mn 2+ is found to be inefficient.An alternative for downconversion through resonant energy transfer is the non-resonant process of cooperative sensitization. For the Tb-Yb couple efficient cooperative energy transfer from the 5 D 4 level of Tb 3+ to two Yb 3+ neighbors is observed with a transfer rate of 0.26 ms À1 . This corresponds to an upper limit of 188% for the conversion efficiency of visible (490 nm) photons to infrared ($1000 nm) photons.

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Section: Vacuum Ultraviolet Spectroscopy and Quantum Cuttingmentioning

confidence: 99%

Photon management with lanthanides

et al. 2006

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“…While the Pr 3+ ion is doped into certain fluoride host lattices, a particular yet interesting optical phenomenon is experimentally observed, the so-called quantum cutting process. 6,34,35 The exhibition of such an optical effect is due to the fact that the spectral terms originating from the 4f 2 and 4f 1 5d 1 electron configurations of the Pr 3+ are well separated on the energy scale, allowing a photon cascade emission. An overlap between the 4f 2 and 4f 1 5d 1 spectral terms is avoided insofar as the excitation of the materials with a high energy photon gives rise to several emitted photons leading to a quantum yield far above 100%.…”

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.

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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.

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“…The recorded absorption spectrum at room-temperature for CdPPr phosphate glass is given in Fig.-3 and Fig.-4 As said above all transitions observed are start from the 3 H4 ground state and these bands are due to the 4f 2 -intra-configurational electric dipole (ED) transitions to different excited states 3 …”

Section: Absorption Studies -Cdppr Glassmentioning

confidence: 89%

“…1 Further, Pr 3+ doped oxides and fluoride materials were useful for red emission applications and the emission processes are explained in the previous studies. [3][4][5][6][7][8][9][10] In such studies, Pr 3+ ions in solids emit more than one visible photon for each incident UV excitation photon. Similarly, the Sm 3+ (4f 5 ) ion is an interesting Ln 3+ ion which emits photo energy with high quantum efficiency from its metastable state 4 G5/2.…”

Section: Introductionmentioning

confidence: 99%

SPECTROSCOPIC INVESTIGATIONS ON Dy3+, Pr3+ AND Sm3+ DOPED Cdo-ZnO-P2O5 GLASSES FOR OPTICAL APPLICATIONS

2017

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The present work deals with cadmium zinc phosphate glasses doped with different rare earth ions like Dy 3+ , Pr 3+ and Sm 3+ . Optical absorption, emission, and excitation studies were carried out on these glasses at room temperature. All the corresponding rare earth doped glasses showed strong characteristic absorption bands from their ground states. Emission studies reveal that all these glasses exhibit visible emission for their respective excitation wavelengths. From these studies, it is found that the present host glass is suitable for white light emission as well as red emission. Therefore these Cd-Zn glasses are useful for lighting applications

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Cascade fluorescent decay in Pr3+-doped fluorides: Achievement of a quantum yield greater than unity for emission of visible light

Cited by 382 publications

References 9 publications

Photon management with lanthanides

Photon management with lanthanides

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

SPECTROSCOPIC INVESTIGATIONS ON Dy3+, Pr3+ AND Sm3+ DOPED Cdo-ZnO-P2O5 GLASSES FOR OPTICAL APPLICATIONS

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