Phosphor decay measurement and its influence on communication properties

Vitasek, Jan; Jargus, Jan; Hejduk, Stanislav; Stratil, Tomas; Látal, Jan; Vašinek, Vladimír

doi:10.1109/icton.2017.8024951

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Undoubtedly, the transfer parameters are fundamentally influenced by the choice of a particular phosphor. Its dynamic properties are mainly determined by measuring the rising and falling edge times in reaction to an exciting rectangular impulse and measuring the luminescence decay time [35,36,37,38].…”

Section: Introductionmentioning

confidence: 99%

Effect of Selected Luminescent Layers on CCT, CRI, and Response Times

et al. 2019

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Phosphors have been used as wavelength converters in illumination for many years. When it is excited with blue light, the frequently used yttrium aluminium garnet doped with cerium (YAG:Ce) phosphor converts a part of blue light to a wideband yellow light, resulting in the generated light having a white color. By combining an appropriate concentration of the YAG:Ce phosphor and blue excitant light, white light of a desired correlated color temperature (CCT) can be obtained. However, this type of illumination has a lower color rendering index value (CRI). In an attempt to improve the CRI value, we mixed the YAG:Ce phosphor with europium-doped calcium sulfide phosphor (CaS:Eu), which resulted in a considerably increased CRI value. This article examines an experiment with luminescent layers consisting of a mixture of selected phosphors and polydimethylsiloxane (PDMS). Different thicknesses in these layers were achieved by changing the speed of rotation during their accumulation onto laboratory glass using the method of spin coating. The spectral characteristics of these luminescent layers as they were excited with blue light emitting diode (LED) and laser diode (LD) were then determined. A suitable combination of the YAG:Ce phosphor with a phosphor containing europium, as it was excited with a blue LED, yielded a source of white light with a CRI value of greater than 85. The response time in the tested luminescent layers to a rectangular excitant impulse (generated by a signal generator and transmitted by LD) was also measured in order to examine their potential use in visible light communications (VLC).

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Section: Introductionmentioning

confidence: 99%

Effect of Selected Luminescent Layers on CCT, CRI, and Response Times

et al. 2019

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“…Most lighting applications are based on a low-volume PDMS structure with luminophores, which is common with white LEDs [19][20][21]. In our work, we are testing largevolume PDMS structures with luminophores because we can combine them with powerful light sources.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of PDMS light bulbs with a luminophore

Novák

Nedoma

Fajkus

et al. 2018

ELECTROTECHNICAL REVIEW

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This article focuses on the production and measurement of incandescent lamps made from polydimethylsiloxane and YAG luminophore. By a suitable combination of these materials along with a light source of a specific wavelength, white colour of light can be achieved. Since the optical power from the light source is fed through a light guide structure to a remote lighting section, the device can be used in hazardous environments such as mines or factories where electromagnetic interference is likely to occur. The study describes temperature characteristics and chromaticity temperature changes of the designed lamp for different luminophore concentrations. Streszczenie. W artykule analizuje sie lampy wykonane z polydimethylsiloxanu PDMS z luminoforem YAG. W lampach tych można osiągnąć białą barwę dzięki odpowiedniej kombinacji materiału. Dzięki odpowiedzniej konstrukcji lampy te można używać w środowiskach niebezpiecznych jak kopalnie. W artykule analizowano temperaturę I barwę światła dla różnych luminoforów. Analiza termiczna lamp PDM z luminoforem.

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“…In recent years, many studies focused on enhancement lighting performance of W-LEDs package with the third approach. In [1,2] [4,5]. However, these research only focus on increasing color uniformity and did not pay much attention to enhancing all luminous flux and color uniformity of WLEDs with high CCT (7700 K).…”

Section: Introductionmentioning

confidence: 99%

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Tin¹,

Minh

Nhân³

et al. 2018

AUSMT

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In this manuscript, we propose a recommendation for improving the correlated color temperature deviation (D-CCT) and the lumen output of 7700 K WLEDs by adding the green-emitting CaF2:Ce 3+ ,Tb 3+ phosphor into the yellowemitting YAG:Ce phosphor compounding. From the research results, the D-CCT could decrease more than 4 times, and the lumen output increased more than 1,5 times in comparison with the non-green-emitting CaF2:Ce 3+, Tb 3+ phosphor case. The results show that green-emitting CaF2:Ce 3+, Tb 3+ phosphor could become a new recommendation for enhancing the D-CCT and the lumen output of WLEDs.

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Phosphor decay measurement and its influence on communication properties

Cited by 4 publications

References 9 publications

Effect of Selected Luminescent Layers on CCT, CRI, and Response Times

Effect of Selected Luminescent Layers on CCT, CRI, and Response Times

Thermal analysis of PDMS light bulbs with a luminophore

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

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