Pressure dependence and thermal quenching of chromium photoluminescence in Cs2NaYCl6:Cr3+

Rinzler, Andrew G.; Dolan, J.F.; Kappers, L.A.; Hamilton, Douglas S.; Bartram, R.H.

doi:10.1016/0022-3697(93)90119-c

Cited by 34 publications

(13 citation statements)

References 22 publications

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“…In contrast, pressure‐dependent luminescence energy differences have been recorded for many solid chromium(III) materials . The best known example is ruby itself, with a pressure‐induced red shift of the R 1 line luminescence ( 2 E→ 4 A 2 ) on the order of −0.7 cm −1 kbar −1 .…”

Section: Methodsmentioning

confidence: 99%

Molecular Ruby under Pressure

et al. 2018

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The intensely luminescent chromium(III) complexes [Cr(ddpd) ] and [Cr(H tpda) ] show surprising pressure-induced red shifts of up to -15 cm kbar for their sharp spin-flip emission bands (ddpd=N,N'-dimethyl-N,N'-dipyridine-2-yl-pyridine-2,6-diamine; H tpda=2,6-bis(2-pyridylamino)pyridine). These shifts surpass that of the established standard, ruby Al O :Cr , by a factor of 20. Beyond the common application in the crystalline state, the very high quantum yield of [Cr(ddpd) ] enables optical pressure sensing in aqueous and methanolic solution. These unique features of the molecular rubies [Cr(ddpd) ] and [Cr(H tpda) ] pave the way for highly sensitive optical pressure determination and unprecedented molecule-based pressure sensing with a single type of emitter.

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Section: Methodsmentioning

confidence: 99%

Molecular Ruby under Pressure

et al. 2018

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“…Pressure sensitivity of the broadband 4 T 2 → 4 A 2 transition as a function of the bulk modulus B 0 of a series of Cr 3+ -activated crystals of different nature (chlorides, − fluorides, ,− and oxides ,− ).…”

Section: Resultsmentioning

confidence: 99%

Predicting the Optical Pressure Sensitivity of ²E → ⁴A₂ Spin-Flip Transition in Cr³⁺-Doped Crystals

et al. 2021

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Understanding the role played by the material chemistry to increase the pressure sensitivity of new optical pressure probes is of great scientific interest. After almost 50 years from the first proposal as an optical pressure sensor, the R-line emission of ruby (α-Al2O3:Cr3+) is still the standard pressure probe used for the diamond anvil cell experiments in worldwide laboratories. Besides the fundamental importance of developing new materials able to discriminate pressure variations with high sensitivity, the ability to predict the potentials of new materials is still a huge challenge. In this view, the pressure dependence of the R-lines in mullite-type Bi2M4O9:Cr3+ (M = Ga, Al) systems is exploited as a case study. Despite the promising performances as a pressure sensor, the mixing between 4T2 and 2E hinders the applicability of Bi2Ga4O9:Cr3+, while Bi2Al4O9:Cr3+ is characterized by a linear trend in the whole pressure range explored and a remarkable sensitivity higher than ruby. The analysis of the Cr3+-based pressure sensors in terms of crystal field, nephelauxetic effect, and bulk modulus led to a universal relationship between the pressure sensitivity and the ambient pressure 2E energy of Cr3+-doped phosphors, allowing the prediction of highly sensitive optical pressure sensors.

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“…It has a slope of −χ bulk = −3.8 × 10 -3 kbar -1 . , This illustrates that the local compressibility at the TiCl 6 4- dopant site is roughly a factor of 4 lower than the compressibility of the NaCl host material. Several previous pressure studies on transition-metal-doped inorganic systems have focused on the differences between the local compressibility of the optically active unit and the bulk compressibility of the host. , Often, the conclusion was reached that the basic assumption of the point charge model, namely, that 10 Dq ∝ R - n with n = 5, is slightly incorrect, and consequently n was estimated to adopt values between 4.5 and 6, depending on the system. − Other studies relate the differences between χ loc and χ bulk to size differences between dopant ion and substituted host ions . None of these two explanations alone can satisfactorily account for the factor of 4 difference between χ loc and χ bulk in Ti 2+ :NaCl.…”

Section: Discussionmentioning

confidence: 99%

Effects of High Pressure on the Luminescence and Upconversion Properties of Ti²⁺-Doped NaCl

2002

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The luminescence and upconversion properties of 0.8% Ti2+-doped NaCl at 15 K are studied as a function of external hydrostatic pressure. Luminescence band maxima shifts are analyzed with a ligand field point charge model, allowing an estimate of the compressibility of the spectroscopically active TiCl6 4- unit in the NaCl host matrix. The pressure dependencies of the vibrational fine structures in the two Ti2+ luminescence bands are analyzed and interpreted in terms of pressure-induced changes in equilibrium distortions and force constants of the emitting electronic states 3T2g(t2geg) and 3T1g(t2geg). Time-resolved luminescence measurements are used to study the effects of pressure on the excited-state dynamics. 15 K near-infrared excitation at 9399 cm-1 leads to upconversion luminescence in the red spectral region both at ambient pressure and 34 kbar. On the basis of time-dependent upconversion luminescence experiments, two fundamentally different upconversion mechanisms are found to be dominant under these two experimental conditions. In particular, pressure is found to switch on an efficient upconversion mechanism, which is inactive at ambient pressure, leading to an estimated order-of-magnitude enhancement of the overall upconversion efficiency at 34 kbar. This additional mechanism involves energy transfer (ET) between two excited Ti2+ ions. Its occurrence only at high pressure is interpreted in terms of a strongly pressure-dependent spectral overlap integral governing the efficiency of the ET step.

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Pressure dependence and thermal quenching of chromium photoluminescence in Cs2NaYCl6:Cr3+

Cited by 34 publications

References 22 publications

Molecular Ruby under Pressure

Molecular Ruby under Pressure

Predicting the Optical Pressure Sensitivity of ²E → ⁴A₂ Spin-Flip Transition in Cr³⁺-Doped Crystals

Effects of High Pressure on the Luminescence and Upconversion Properties of Ti²⁺-Doped NaCl

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Pressure dependence and thermal quenching of chromium photoluminescence in Cs2NaYCl6:Cr3+

Cited by 34 publications

References 22 publications

Molecular Ruby under Pressure

Molecular Ruby under Pressure

Predicting the Optical Pressure Sensitivity of 2E → 4A2 Spin-Flip Transition in Cr3+-Doped Crystals

Effects of High Pressure on the Luminescence and Upconversion Properties of Ti2+-Doped NaCl

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Predicting the Optical Pressure Sensitivity of ²E → ⁴A₂ Spin-Flip Transition in Cr³⁺-Doped Crystals

Effects of High Pressure on the Luminescence and Upconversion Properties of Ti²⁺-Doped NaCl