Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors

Lyapin, A.A.; Gushchin, S. V.; Ermakov, A. S.; Kuznetsov, S. V.; Ryabochkina, P. A.; Proydakova, V. Yu.; Voronov, V. V.; Федоров, П. П.; Chernov, M. V.

doi:10.3788/col201816.091901

Cited by 11 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The backlighting fields, in addition, requires adequate green emission to retain the vividness of the light effectively. Therefore, the utilization of phosphor combination of YAG: Ce 3+ yellow phosphor and (Sr, Ca) 2Si5N8: Eu 2+ red phosphor for a blue-pumping LED chip [8]- [10] were not successfully meet this requirement. This combination could not provide efficient green emission spectra.…”

Section: Introductionmentioning

confidence: 99%

Efficient bright green phosphor for white light-emitting diode using in backlight application

Doan Duy,

Hanh Nguyen Thi,

Thinh Nhan

2023

IJEECS

View full text Add to dashboard Cite

The (Ba,Ca)ScO2F:Bi3+,K+ phosphor with narrow emission band and green emission color peaking at 510 nm is demonstrated in the study. This phosphor is prepared using a solid-state reaction at high temperatures. Based on characterizing data, the increasing concentration of Ca2+ induces the shrinkage of the unit cell and the narrower spacing, leading to the increase in the photoluminescence of the phosphor. This also cause a red shift in the emitting range from 504 nm to 510 nm. The phosphor shows good absorption peaking at 415 nm, matching the excitation wavelength of the used nearultraviolet (UV) light emitting diode (LED) chip. When being applied in a white light‐emitting diodes (WLED) with 4,000 K, the phosphor could increase the luminous flux as its doping concentration increase. Besides, the WLED doping (Ba, Ca) ScO2F: Bi3+, K+ shows emission regions in blue, green, and red wavelength bands. The data from the study indicates that the phosphor is potential for developing the white-LED for backlight purposes.

show abstract

Section: Introductionmentioning

confidence: 99%

Efficient bright green phosphor for white light-emitting diode using in backlight application

Doan Duy,

Hanh Nguyen Thi,

Thinh Nhan

2023

IJEECS

View full text Add to dashboard Cite

show abstract

Multiband emission from single β-NaYF4(Yb,Er) nanoparticles at high excitation power densities and comparison to ensemble studies

et al. 2021

View full text Add to dashboard Cite

Ensemble and single particle studies of the excitation power density (P)-dependent upconversion luminescence (UCL) of core and core-shell β-NaYF4:Yb,Er upconversion nanoparticles (UCNPs) doped with 20% Yb3+ and 1% or 3% Er3+ performed over a P regime of 6 orders of magnitude reveal an increasing contribution of the emission from high energy Er3+ levels at P > 1 kW/cm2. This changes the overall emission color from initially green over yellow to white. While initially the green and with increasing P the red emission dominate in ensemble measurements at P < 1 kW/cm2, the increasing population of higher Er3+ energy levels by multiphotonic processes at higher P in single particle studies results in a multitude of emission bands in the ultraviolet/visible/near infrared (UV/vis/NIR) accompanied by a decreased contribution of the red luminescence. Based upon a thorough analysis of the P-dependence of UCL, the emission bands activated at high P were grouped and assigned to 2–3, 3–4, and 4 photonic processes involving energy transfer (ET), excited-state absorption (ESA), cross-relaxation (CR), back energy transfer (BET), and non-radiative relaxation processes (nRP). This underlines the P-tunability of UCNP brightness and color and highlights the potential of P-dependent measurements for mechanistic studies required to manifest the population pathways of the different Er3+ levels.

show abstract

Microstructural, spectroscopic and mechanical properties of hot-pressed Er:SrF2 transparent ceramics

Liu

et al. 2021

Journal of the European Ceramic Society

View full text Add to dashboard Cite

Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors

Cited by 11 publications

References 28 publications

Efficient bright green phosphor for white light-emitting diode using in backlight application

Efficient bright green phosphor for white light-emitting diode using in backlight application

Multiband emission from single β-NaYF4(Yb,Er) nanoparticles at high excitation power densities and comparison to ensemble studies

Microstructural, spectroscopic and mechanical properties of hot-pressed Er:SrF2 transparent ceramics

Contact Info

Product

Resources

About