Temperature dependent persistent luminescence: Evaluating the optimum working temperature

Du, Jiaren; Clercq, Olivier Q. De; Poelman, Dirk

doi:10.1038/s41598-019-46889-z

Cited by 54 publications

(47 citation statements)

References 48 publications

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“…Considering the temperature‐dependent persistent luminescence in persistent phosphors, we have demonstrated the clear relation between the efficient temperature range of the afterglow output and the corresponding thermoluminescence glow curve in our previous work . The concept of the optimum working temperature was proposed as a new means for evaluating persistent phosphors.…”

Section: Resultsmentioning

confidence: 80%

“…Figure S2a,b (Supporting Information) displays the TL glow curves with different fading duration after 10 min charging at −70 and −80 °C, respectively. Unlike other persistent phosphors in which TL intensity is seriously constrained by the thermal barrier and the limited efficiency of the trap filling, for instance, Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ that has a relative low TL intensity and excitation at low temperature does not lead to efficient trap filling, MGGO:Cr 3+ exhibits an intense TL signal and is fully excitable even at −80 °C. With a longer fading duration, the position of the TL glow peak moves to higher temperature.…”

Section: Resultsmentioning

confidence: 96%

“…Here, a Gaussian shape was chosen where the mean energy E G and the width of the Gaussian function σ G are dependent on the phosphors. Gaussian distributions were selected as a reasonable assumption for a random incorporation of trap states as reported in previous literature . The temperature‐dependent afterglow profiles were simulated with the obtained parameters from thermoluminescence data by using the following expression

I (t) = \int_{0}^{\infty} s N (E) f_{0} (T) e^{- E / k T} \exp [- s t {normale}^{- E / k T}] normald E

…”

Section: Methodsmentioning

confidence: 99%

“…Besides, the synthesis of such a phosphor containing a large number of traps distributed at very shallow energy levels has barely been reported. Third, often the occurrence of a thermal barrier inside materials is preventing an efficient charge‐trapping process, for instance, the insufficient charging in Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ at low temperature . Such a phosphor system can hardly be activated or charged by an excitation source (i.e., ultraviolet or blue light irradiation) in extremely low‐temperature ambient, and the persistent luminescence performance is thus negatively affected by insufficient charging.…”

Section: Introductionmentioning

confidence: 99%

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Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Poelman

2019

Advanced Optical Materials

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Room‐temperature persistent phosphors emitting in a wide spectral range are extensively explored owing to their commercial interest in applications such as night‐vision signs and medical imaging. However, phosphors featuring long‐lasting near‐infrared emission at extremely low temperature are barely reported so far. Herein, a design of trivalent chromium‐activated magnesium gallogermanates (Mg1+xGa2−2xGexO4:Cr3+) is demonstrated that exhibit strong near‐infrared afterglow emission at low temperature, e.g., −80 °C. Notably, this new persistent phosphor can be efficiently activated even at these low temperatures. A combination of experimental characterizations together with simulations has identified its novel low‐temperature persistent luminescence and good capacity of stabilizing a large number of very shallow traps. The finding of this low‐temperature near‐infrared afterglow property opens up a new frontier for exploring persistent phosphors and provides an opportunity for novel applications at extreme conditions, such as cryopreservation of biological samples.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 96%

I (t) = \int_{0}^{\infty} s N (E) f_{0} (T) e^{- E / k T} \exp [- s t {normale}^{- E / k T}] normald E

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Poelman

2019

Advanced Optical Materials

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“…The persistent luminescence from Mn 4+ doped La 2 MgGeO 6 is largely restricted to the fact that the traps are relatively deep, and thus, do not contribute significantly to the RT afterglow performance. It is known that the ideal working temperature of persistent luminescence is dependent on its trap depth and trap distribution [36]. To investigate the temperature-dependent persistent luminescence, the ambient temperature for the charging and afterglow process was chosen at 20 • C, 60 • C, 80 • C and 100 • C, respectively (in Figure 10a-d. After 10 min UV excitation, the heating stage starts at 30 s or 20 min (TL fading time) with a constant heating rate of 60 • C/min.…”

Section: Temperature-dependent Persistent Luminescencementioning

confidence: 99%

Facile Synthesis of Mn4+-Activated Double Perovskite Germanate Phosphors with Near-Infrared Persistent Luminescence

Poelman

2019

Nanomaterials

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Tetravalent manganese doped phosphors are emerging as a new class of efficient near-infrared emitters for applications in a variety of areas, such as bioimaging and night-vision surveillance. Novel double perovskite-type La 2 MgGeO 6 :Mn 4+ phosphors were successfully prepared using a microwave-assisted energy-saving solid state method. This simple technique involving the use of a microwave susceptor allows for a reduction of the preparation time compared to a conventional solid state reaction. The samples were investigated using powder X-ray diffraction, scanning electron microscopy, as well as energy-dispersive X-ray spectroscopy mapping, photoluminescence excitation/emission spectroscopy, persistent luminescence decay and temperature-dependent photoluminescence analysis. Substitution between isovalent Mn 4+ and Ge 4+ can be achieved without additional charge compensators in this germanate-based phosphor, which provides strong emission in the near-infrared spectral region, assigned to the characteristic transitions of tetravalent manganese ions. Additionally, the double perovskite-type germanate phosphor exhibits excellent luminescence thermal stability. Moreover, the spectroscopic properties, excitation wavelength-dependent and temperature-dependent persistent luminescence were studied. A series of thermoluminescence measurements were presented trying to give clear information on the charging process, afterglow behavior and the nature of the traps responsible for the persistent luminescence. The present investigation expands the range of available promising near-infrared emitting persistent phosphors for medical imaging.Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ with blue emission and CaAl 2 O 4 :Eu 2+ , Nd 3+ having violet emission [7][8][9][10]. Development of persistent phosphors in wavelengths beyond the visible spectral region, particularly in the near-infrared (NIR), has been of great significance, ranging from night-vision surveillance to medical imaging. Biomarkers or nanoparticles with persistent luminescence in the NIR optical window can be used as ideal agents for high-sensitivity medical imaging as they allow bio-imaging without external excitation, without autofluorescence and with high signal-to-noise ratio in biological tissues [11,12]. This state-of-the-art bio-imaging technology has motivated the exploration of NIR emitting persistent phosphors with high radiance and long duration.Tetravalent manganese (Mn 4+ ) doped phosphors have been applied as a red color component for phosphor-converted white light-emitting diodes [13]. Mn 4+ ions with 3d 3 electron configuration can substitute for Al 3+ , Ga 3+ , Si 4+ , Ti 4+ , Zr 4+ , and Ge 4+ ions and be stabilized in octahedral symmetry environment of several hosts. However, in regard to NIR persistent luminescence, the number of the reported Mn 4+ doped phosphors is very limited [14][15][16][17]. Phosphors with double perovskite crystal structure have attracted increasing attention, due to their unique properties and potential applications. The double perovski...

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A Standalone, Battery‐Free Light Dosimeter for Ultraviolet to Infrared Light

Heggen

Žilėnaitė

Ezerskyte

et al. 2021

Adv Funct Materials

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Light sensors are widely used to monitor light intensities, for instance in medical applications, in agriculture or for conservation of art. Most of these sensors are electronic devices that record continuously but applications that only require information of integrated intensities, measured over a long time, could greatly benefit from an integrating dosimeter that does not require a power supply. In this work a wireless and quantitative light dosimeter is presented based on SrAl 2 O 4 :Eu 2+ ,Sm 3+ , a phosphor that exhibits stable energy storage upon exposure to blue and ultraviolet light. It is shown that a forward electron transfer from europium to samarium can be induced under illumination with blue or ultraviolet light while the reverse electron transfer can be achieved by illuminating the phosphors with green to infrared light. This reverse transfer is accomplished through excitation of the divalent samarium and results in bright, green optically stimulated luminescence. The stable energy storage, in combination with the possibility for optical read-out, makes SrAl 2 O 4 :Eu 2+ ,Sm 3+ ideally suited to be used as an integrating light dosimeter for monochromatic to broadband light, from the ultraviolet to the near infrared. To demonstrate this, a proof of concept dosimeter was developed in which this phosphor was successfully used to measure average daylight intensities.

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Temperature dependent persistent luminescence: Evaluating the optimum working temperature

Cited by 54 publications

References 48 publications

Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Facile Synthesis of Mn4+-Activated Double Perovskite Germanate Phosphors with Near-Infrared Persistent Luminescence

A Standalone, Battery‐Free Light Dosimeter for Ultraviolet to Infrared Light

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Temperature dependent persistent luminescence: Evaluating the optimum working temperature

Cited by 54 publications

References 48 publications

Identifying Near‐Infrared Persistent Luminescence in Cr3+‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Identifying Near‐Infrared Persistent Luminescence in Cr3+‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Facile Synthesis of Mn4+-Activated Double Perovskite Germanate Phosphors with Near-Infrared Persistent Luminescence

A Standalone, Battery‐Free Light Dosimeter for Ultraviolet to Infrared Light

Contact Info

Product

Resources

About

Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature

Identifying Near‐Infrared Persistent Luminescence in Cr³⁺‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature