Samarium and manganese incorporation to improve color rendering of LuAG:Ce<sup>3+</sup> phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

Sun, Bingheng; Jiang, Benxue; Zhang, Long

doi:10.1039/d1tc04370f

Cited by 10 publications

(10 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained τ value was reduced from 64.3 to 47.4 ns, favoring the inevitability of ET from Ce 3+ to Mn 2+ . Moreover, the ET efficiency (η) was calculated using the following equation 24 :…”

Section: 4mentioning

confidence: 99%

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Yu,

Sun,

Fan

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Transition‐metal Mn2+ ion‐doped transparent ceramics (TCs) are promising color‐convertors to improve color rendition for solid‐state lighting. However, the stabilization of Mn2+ remains a challenge owing to the changeable atmosphere in the specific preparation of TC. In this work, the variations of valence states of Mn ions in typical garnet lattice host (YAG and LuAG) throughout the TC fabrication were demonstrated. By combined first principles calculation and experimental investigation, an enhanced self‐reduction of Mn ions was clarified in LuAG host, which was originated from the higher concentration of oxygen vacancy defects. Moreover, the air annealing treatment could significantly weaken and enhance the absorption of Mn2+ and Mn3+ respectively, degrading the orange–red emission peaking at 594 nm. On account of the oxidation of Mn2+ ions, a photoluminescence spectra redshift of 9 nm was observed with increasing air annealing temperature and oxygen content, owing to strengthened crystal field strength surrounding Mn2+ ions. Finally, a high color rendering index of 74.5 of resultant white laser diodes device structured by single‐phase LuAG:Ce,Mn TCs was obtained based on an efficient energy transfer process from Ce3+ to Mn2+. This study will deepen the understanding of the crystal defects inside TCs on luminescence properties, as well as inspiring more exploration on defect control to develop high performance ceramic color‐convertor.

show abstract

Section: 4mentioning

confidence: 99%

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Yu,

Sun,

Fan

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, Sm 3+ is difficult to be excited by blue LD, limiting its applications in high-power wLD lighting. With this in mind, Sun et al [ 77 ] doped Ce 3+ and Sm 3+ synchronously into LuAG to form highly transparent Lu 2.98− x Ce 0.02 Sm x Al 5 O 12 (LuAG:0.02Ce 3+ , x Sm 3+ ) ( x = 0.001–0.01) ceramics through vacuum sintering. The XRD pattern, the lattice parameter of LuAG:0.02Ce 3+ , x Sm 3+ ceramics versus Sm 3+ concentration, and the retrieved refinement of LuAG:0.02Ce 3+ ,0.04Sm 3+ ceramic have all evidenced the substitution of Ce 3+ and Sm 3+ for Lu 3+ in the LuAG:Ce 3+ ,Sm 3+ ceramics.…”

Section: Combining the Strategies Of 2 Andmentioning

confidence: 99%

“…(d) Schematic energy level diagram of Ce 3+ , Sm 3+ , and Mn 2+ . Reprinted with permission from ref [77]…”

mentioning

confidence: 99%

Recent Advances in Preparing Transparent Phosphor Ceramics for High-Index Color Rendering and High-Power Lighting

Du,

Li,

Zhang

et al. 2024

Molecules

View full text Add to dashboard Cite

In recent years, high-power white light-emitting diode (wLED)/laser diode (wLD) lighting sources based on transparent phosphor ceramic (TPC) materials have attracted increasing application interest in automotive headlights, projection displays, and space navigation lighting due to their superior brightness, lighting distance, compactness, lifespan, and environmental resistance compared with the widely used phosphor-converted wLEDs. However, preparing TPC-converted wLEDs/wLDs with high color rendering index (CRI) remains a huge challenge, which limits their widespread application. In this review, we summarize the recently adopted strategies for constructing TPCs to develop high-power wLEDs/wLDs with high CRI values (>75). The construction protocols were categorized into four groups: host regulation, red-emitter doping, host regulation/red-emitter doping combination, and composite structure design. A comprehensive discussion was conducted on the design principles, photoluminescent properties, and device performances for each strategy. The challenges and future trends of high-power and high-CRI wLEDs/wLDs based on TPCs are also discussed toward the end of this review.

show abstract

“…The emission peak under excitation of 450 nm of YAG:Ce 3 is located at 540 nm, showing a typical green luminescence that corresponds to the transitions of 5d 1 → 2 F 5=2 and 5d 1 → 2 F 7=2 . When the 5d state electron transits to the 2 F 5=2 and 2 F 7=2 , the two emission spectra superimpose an asymmetric broadband [21,22] . The spectral intensity of PL and PLE decreases with the increase of Ce 3 concentration, but the range of change is small.…”

Section: Materials Characterizationmentioning

confidence: 99%

Y3Al5O12:Ce3+ fluorescent ceramic for optical data storage

Zhang

Zhao

et al. 2023

中国光学快报

View full text Add to dashboard Cite

A kind of optical data storage medium based on electron-trapping materials, Y 3 Al 5 O 12 :Ce 3 fluorescent ceramic, was developed by vacuum sintering technology. The medium shows sufficiently deep traps (1.67 and 0.77 eV). The properties of trap levels were researched by thermoluminescence curves, and the optical storage mechanism based on Ce 3 ion doping was proposed. More importantly, the data can be written-in by 254 nm UV light, and readout by heating (300°C). This work expands the application fields of fluorescent ceramics, and it is expected to promote the development of electron-trapping materials.

show abstract

Samarium and manganese incorporation to improve color rendering of LuAG:Ce³⁺ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

Abstract: A multi-channel energy transfer scheme was established in LuAG:Ce3+,Sm3+,Mn2+ phosphor ceramics to obtain a high color rendering index of white LDs.

Cited by 10 publications

References 45 publications

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Recent Advances in Preparing Transparent Phosphor Ceramics for High-Index Color Rendering and High-Power Lighting

Y3Al5O12:Ce3+ fluorescent ceramic for optical data storage

Contact Info

Product

Resources

About

Samarium and manganese incorporation to improve color rendering of LuAG:Ce3+ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

Abstract: A multi-channel energy transfer scheme was established in LuAG:Ce3+,Sm3+,Mn2+ phosphor ceramics to obtain a high color rendering index of white LDs.

Cited by 10 publications

References 45 publications

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Defect assisted self‐reduction and post annealing of Mn ions activated garnet transparent ceramics

Recent Advances in Preparing Transparent Phosphor Ceramics for High-Index Color Rendering and High-Power Lighting

Y3Al5O12:Ce3+ fluorescent ceramic for optical data storage

Contact Info

Product

Resources

About

Samarium and manganese incorporation to improve color rendering of LuAG:Ce³⁺ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study