Temperature-dependent fluorescence decay lifetimes of the phosphor Y3(Al0.5Ga0.5)5O12:Ce 1%

Allison, S. W.; Buczyna, Jason R.; Hansel, Rachael A.; Walker, D. G.; Gillies, G. T.

doi:10.1063/1.3077262

Cited by 21 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…from tens of kHz to tens of MHz). This is in sharp contrast to the thermographic luminophores based on rare-earth-doped oxides 9,13,16,41,42 , which are characterized by much slower emission that is typically in the ms-range. Furthermore, the absorption coefficients of tin halides for the UV-A range (315-400 nm, convenient for optical excitation) are high, and they are comparable to the bandgap absorption values (Fig.…”

Section: Resultsmentioning

confidence: 68%

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Yakunin¹,

Benin²,

Shynkarenko³

et al. 2019

Nat. Mater.

279

258

View full text Add to dashboard Cite

bolometric detectors, owing to advancements in MEMS-technologies (Micro-Electro-Mechanical Systems) 6,7 , have already entered the consumer electronics market, and are able to record thermal images with both high speed and high resolution. However, their thermographic performance, based on measurements of IR radiation intensity, is inherently limited by the transparency and emissivity/reflectivity of an observed object and, more importantly, by any material and medium (window, coating, matrix, solvent etc.) situated within the path between the detector and an object ( Fig. 1). As one of the major consequences, IR thermography cannot be easily combined with conventional optical microscopy or other enclosed optical systems such as cryostats or microfluidic cells.An alternative method for remote thermography, which is unhindered by enclosures or IRabsorptive media, utilizes temperature sensitive luminophores (i.e. fluorophores or phosphors) with PL in the visible spectral range (Fig. 1c) that are deposited onto, or incorporated into, the object of interest as temperature probes [8][9][10][11][12][13][14][15][16] . To probe an object's temperature, the luminophore is then excited by an ultraviolet or visible (UV-Vis) pulsed source (e.g. laser or light-emitting diode) and the temperature-dependent PL lifetime decay is then analyzed by time-resolving detectors.This PL-lifetime approach exhibits several benefits: the excitation power and, consequently the PL intensity, can be adjusted to a value appropriate for the dynamic range of the detector.Additionally, the use of UV-Vis light, rather than mid-to long-wavelength IR radiation, allows for the direct integration of this method with conventional optical spectroscopy and microscopy applied in biological studies and materials research. Furthermore, higher spatial resolutions can be obtained with visible light (400-700 nm) as the diffraction-limit is ca. 20-times sharper than for LWIR (7-14 µm); this potentially extends the utility of remote thermography to intracellular, in vitro, and in vivo studies 17 .

show abstract

Section: Resultsmentioning

confidence: 68%

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Yakunin¹,

Benin²,

Shynkarenko³

et al. 2019

Nat. Mater.

279

258

View full text Add to dashboard Cite

show abstract

“…[16][17][18] Therefore, much effort has been spent on investigating the thermal performance of high-power LED packages as well as phosphors. [19][20][21][22][23][24][25][26] Fan et al 25) compared conventional and thermal-isolated phosphor coatings by both experiments and finite-element simulations. They found that the surface temperature of the thermal-isolated phosphor coating layer was 16.8 C lower than that of the conventional packaging.…”

Section: Introductionmentioning

confidence: 99%

Hotspot Location Shift in the High-Power Phosphor-Converted White Light-Emitting Diode Packages

Luo

Zheng

2012

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

Thermal management of high-power light-emitting diodes (LEDs) plays an important role in determining their optical properties, reliability, and lifetime. In this paper, we present a method to study the temperature field of phosphor-converted LED packages by combining the Monte Carlo optical simulation and finite element simulation together. The temperature field, including the heat generation in both LED chip and phosphor layer, are presented and analyzed. It was found that temperature increased with the increase in phosphor concentration and the hotspot location in remote phosphor-coating packages shifted with the changes in phosphor concentration, while there was no shift in direct phosphor-coating packages. It was concluded that the hotspot location in the high-power phosphor-converted white LED packages depended on phosphor concentrations as well as packaging methods.

show abstract

“…Phosphor-coated white light emitting diodes (LEDs) are widely used for white light illumination due to their high brightness, energy efficiency, and low cost. However, phosphors have a long photoluminescence lifetime (∼60 ns), − which limits the LED modulation bandwidth to ∼5 MHz. , More recently, there have been numerous efforts to find alternatives such as quantum dots, , polymer blends, and perovskites to replace phosphors. However, getting the right color rendering index is difficult, and this approach involves replacing all existing white LED lights.…”

mentioning

confidence: 99%

Textured V-Pit Green Light Emitting Diode as a Wavelength-Selective Photodetector for Fast Phosphor-Based White Light Modulation

et al. 2017

View full text Add to dashboard Cite

We demonstrate the ability to overcome the slow data transmission of a phosphor-coated white light emitting diode (LED) by replacing a conventional Si photodiode with a narrowband, green InGaN LED as receiver. By relying on the wavelength selectivity of an InGaN LED, we are able to detect the fast blue light components and reject the slow phosphor components from white light illumination, thereby increasing the modulation speed significantly from 5 MHz to 20 MHz. V-pit texturing is used to improve the peak responsivity of InGaN LEDs to 0.23 A/W at 380 nm, which is comparable with the highest values reported in InGaN detectors. Such V-pit structures also help to shield nonradiative recombination at threading dislocations, so that a high breakdown voltage of −40 V with a high bandwidth of 275 MHz can be obtained. This demonstrates the suitability of V-pit textured InGaN LEDs to function not only as a bright emitter but also as a highly responsive, fast photodetector. This dual functionality enables high-speed LED-to-LED communications, without the need for an extra photodetector.

show abstract

Temperature-dependent fluorescence decay lifetimes of the phosphor Y3(Al0.5Ga0.5)5O12:Ce 1%

Cited by 21 publications

References 15 publications

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Hotspot Location Shift in the High-Power Phosphor-Converted White Light-Emitting Diode Packages

Textured V-Pit Green Light Emitting Diode as a Wavelength-Selective Photodetector for Fast Phosphor-Based White Light Modulation

Contact Info

Product

Resources

About