Insight into the Thermal Quenching Mechanism for Y3Al5O12:Ce3+ through Thermoluminescence Excitation Spectroscopy

Ueda, Jumpei; Dorenbos, P.; Bos, A.J.J.; Meijerink, Andries; Tanabe, Setsuhisa

doi:10.1021/acs.jpcc.5b08828

Cited by 306 publications

(231 citation statements)

References 37 publications

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“…In addition to the thermal quenching affecting the emission intensity we also find that it affects emission lifetime, which is consistent with previous measurements of other lanthanide-doped complexes [77,[81][82][83]. We characterize the influence of thermal quenching on the lifetime of [Y 1−x Dy x (acac) 3 (phen)] by measuring the lifetime of the emission at 482 nm and 575 nm for the 10 mol% sample, as shown in Figure 12.…”

Section: Luminescence Lifetimesupporting

confidence: 89%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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We develop a two-color thermometry (TCT) phosphor based on [Y1−xDyx(acetylacetonate)3(1,10-phenanthroline)] ([Y1−xDyx(acac)3(phen)]) molecular crystals for use in heterogeneous materials. We characterize the optical properties of [Y1−xDyx(acac)3(phen)] crystals at different temperatures and Dy concentrations and find that the emission is strongly quenched by increasing temperature and concentration. We also observe a broad background emission (due to the ligands) and find that [Y1−xDyx(acac)3(phen)] photodegrades under 355 nm illumination with the photodegradation resulting in decreased luminescence intensity. However, while decreasing the overall emission intensity, photodegradation is not found to influence the integrated intensity ratio of the 4 I 15/2 → 6 H 15/2 and 4 F 9/2 → 6 H 15/2 transitions. This ratio allows us to compute the temperature of the complex Based on the temperature dependence of these ratios we calculate that [Y1−xDyx(acac)3(phen)] has a maximum sensitivity of 1.5 % K −1 and our TCT system has a minimum temperature resolution of 1.8 K. Finally, we demonstrate the use of [Y1−xDyx(acac)3(phen)] as a TCT phosphor by determining a dynamic temperature profile using the emission from [Y1−xDyx(acac)3(phen)].

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Section: Luminescence Lifetimesupporting

confidence: 89%

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

2017

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“…TLE spectroscopy is a powerful tool to investigate whether thermal ionization from the excited 5d state occurs [18,19,29]. The observation of a peak in a TL glow curve is a direct evidence of thermal ionization, because the trap filling from the excited state proceeds by electron transport to the conduction band and trapping of the conduction-band electrons.…”

Section: E Tle Analysismentioning

confidence: 99%

Thermal ionization and thermally activated crossover quenching processes for5d−4fluminescence inY3Al
Ueda
¹
,
Meijerink
²
,
Dorenbos
³

et al. 2017
Phys. Rev. B
Self Cite
74
2
42
0
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We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr 3+ -doped Y 3 Al 5−x Ga x O 12 . Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f 2 :3 PJ states of Pr 3+ and the host conduction band (CB). Temperature-dependent luminescence lifetime measurements show that the 5d luminescence quenching temperature T 50% increases up to x = 2 and decreases with further increasing Ga content. This peculiar behavior is explained by a unique transition between the two quenching mechanisms which have an opposite dependence of thermal quenching on Ga content. For low Ga content, thermally activated crossover from the 4f 5d state to the 4f 2 ( 3 PJ ) states is the operative quenching mechanism. With increasing Ga content, the activation energy for thermally activated crossover becomes larger, as derived from the configuration coordinate diagram, while from the vacuum referred binding energy diagram the activation energy of thermal ionization becomes smaller. Based on these results, we demonstrated that the thermal quenching of Pr 3+ : 5d 1 -4f luminescence in Y 3 Al 5−x Ga x O 12 with x = 0, 1, 2 is a thermally activated crossover while for x = 3, 4, 5 it results from the thermal ionization.

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“…10 The thermal stability of white lighting has been particularly important because of the recently proposed laser-driven white lighting. To avoid this color degradation, many methods have been proposed, such as coatings on the phosphor surface, 11,12 solid solutions of phosphor compositions, [13][14][15] and phosphor plates.…”

Section: -6mentioning

confidence: 99%

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Kim

Viswanath

Unithrattil

et al. 2017

ECS J. Solid State Sci. Technol.

127

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In the past decades, solid-state lighting based on phosphors as energy converters has been a fast-growing industry. Phosphorconverted white light-emitting diodes (pc-wLEDs) enable high-power applications and miniaturization; for this, the phosphor must have good stability and high efficiency. In order to satisfy this demand, phosphor plates have been proposed instead of conventional organic-based phosphor binders. In this review, such phosphor plates are categorized according to their synthesis methods, and the advantages and disadvantages of each category are detailed. In addition, we describe the major aspects of phosphor plates that require improvement for applications in high-power devices. For the fabrication of high-power LEDs, the phosphor configuration, color purity, porosity, and particle size of glass powders are key properties to enhance the luminescence efficiency and reduce the generation of heat inside wLED packages, thereby improving thermal stability. The advent of authentic, energy-efficient lighting in the home and workplace significantly affected the modern way of life. Beginning with the mass production of incandescent light bulbs, and with the subsequent evolution of fluorescence lights, lighting technology has developed rapidly in the last few decades. Since Edison's incandescent bulb in 1879, 1 artificial lighting has been developed to increase power output and decrease the size of the system. The development of red light-emitting diodes (LEDs) in 1962 2 and blue LEDs in 1993 3 allowed innovation in lighting and display. In particular, combinations of blue LEDs and yellow phosphors are used for many applications because they can realize cheap and efficient white solid-state lighting with several advantages including long lifetimes, eco-friendly behavior, and the capacity of miniaturization. 4-6In phosphor-converted white LEDs (pc-wLEDs), the phosphor converter dispersed in silicon resin (phosphor-in-silicon; PiS) is directly packed on a blue InGaN chip.7 When driven by a bias current, the emitted blue light absorbed by the phosphor is emitted as yellow light; together with the transmitted blue light, this constitutes white luminescence. However, this method lacks a red component, which entails the drawbacks of a poor color rendering index (CRI) and limited correlated color temperature (CCT). To overcome these drawbacks, one proposed method mixes yellow phosphors with phosphors having green to red emissions under blue excitation. 8 In pc-wLEDs, the color is primarily determined by the ratio of the blue emission from the LED chip to the yellow to red emission from the phosphor. However, the efficacy and brightness are determined by the converted yellow to red emission, as it contributes the bulk of lumens. In this configuration, the heat generated from the LED chip and phosphor cannot be efficiently dissipated because of the poor thermal stability and weak thermal conductivity of the resin, which causes luminous decay and color shifting in white light-emitting diodes (wLEDs).9 When the tempe...

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Insight into the Thermal Quenching Mechanism for Y₃Al₅O₁₂:Ce³⁺ through Thermoluminescence Excitation Spectroscopy

Cited by 306 publications

References 37 publications

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Thermal ionization and thermally activated crossover quenching processes for5d−4fluminescence inY3Al
Ueda
¹
,
Meijerink
²
,
Dorenbos
³

et al. 2017
Phys. Rev. B
Self Cite
74
2
42
0
View full text Add to dashboard Cite

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

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Insight into the Thermal Quenching Mechanism for Y3Al5O12:Ce3+ through Thermoluminescence Excitation Spectroscopy

Cited by 306 publications

References 37 publications

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Two-color thermosensors based on [Y $$_{1-x}$$ 1 - x Dy $$_x$$ x (acetylacetonate) $$_3$$ 3 (1,10-phenanthroline)] molecular crystals

Thermal ionization and thermally activated crossover quenching processes for5d−4fluminescence inY3AlUeda1, Meijerink2, Dorenbos3 et al. 2017Phys. Rev. BSelf Cite742420View full textAdd to dashboardCite

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

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Product

Resources

About

Insight into the Thermal Quenching Mechanism for Y₃Al₅O₁₂:Ce³⁺ through Thermoluminescence Excitation Spectroscopy

Thermal ionization and thermally activated crossover quenching processes for5d−4fluminescence inY3Al
Ueda
¹
,
Meijerink
²
,
Dorenbos
³

et al. 2017
Phys. Rev. B
Self Cite
74
2
42
0
View full text Add to dashboard Cite