Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching

Song, Xiufeng; Fu, Renli; Agathopoulos, Simeon; He, Hong; Zhao, Xinran; Zhang, Shaodong

doi:10.1063/1.3190522

Cited by 47 publications

(21 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors further suggested that the red-shift arose from the formation of Mn 2+ pairs, which have a lower energy level compared to that at lower concentrations of Mn 2+ [149]. While high concentration of activators in the host are known to quench luminescence severely [279][280][281], Zhang's study showed that the ML of CaZnOS over a wide concentration of Mn 2+ activators (0.1 to 10 mol%) is intense enough to be observed by the naked eye in a dark room (see Movie in Ref. [149]).…”

Section: Concentration Effect Of Luminescent Centersmentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

282

196

View full text Add to dashboard Cite

Mechanoluminescence (ML) is generated during exposures of certain materials to mechanical stimuli. Many solid materials produce ML during their fracturing, however, the irreversibility of fracto-induced ML limits the practical applications of these materials. In 1999, Chao-Nan Xu discovered an intense and reproducible ML from trap-controlled materials, including ZnS:Mn 2+ and SrAl 2 O 4 :Eu 2+ , and introduced the principles and applications of hybrid inorganic/organic mechanoluminescent (ML) composites, and related sensors to visualize stress/strain in target structures. This discovery has triggered intense research interest in trap-controlled ML materials and composites over the past 2 decades. Notable achievements of this research include the development of trap-controlled materials that exhibit bright ML emission from the ultraviolet to the near infra-red, and multiscale mechano-optical sensitivities. This research has also increased our understanding of the mechanisms of ML phenomena, enabling the rational design of trap-controlled ML materials. Practical applications of ML are also being driven by the discovery that ML composites can serve as "mechano-optical sensitive skin" for structural health diagnosis, stress sensors for biomechanics, and mechanically-activated light sources. This review focuses on the design, synthesis, characterization, optimization and application of trap-controlled ML materials, and concludes with discussions on future directions of ML research and specific challenges to improve ML materials for real-world applications.

show abstract

Section: Concentration Effect Of Luminescent Centersmentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

282

196

View full text Add to dashboard Cite

show abstract

“…In order to emit light in the visible region of electromagnetic spectrum, synthesized phosphors have to absorb in near UV to blue spectral range thereby limiting the activators to Eu 2+ and Ce 3+ that can be used in phosphors. Among these silicon oxynitrides, Eu doped MSi 2 O 2 N 2 (M = Sr, Ba, Ca) is found to be excellent candidates owing to better thermal and chemical stability with a broad absorption band spanning from UV to blue region of the electromagnetic spectrum 13–21. SrSi 2 O 2 N 2 is isotypic with EuSi 2 O 2 N 2 and crystallizes in triclinic structure and has P1(1) space group symmetry 13.…”

Section: Introductionmentioning

confidence: 99%

Luminescence characteristics of Sr_1−xBa_xSi₂O₂N₂:Eu²⁺ phosphors for white light emitting diodes

Anoop

Cho

Suh

et al. 2012

Physica Status Solidi (a)

View full text Add to dashboard Cite

Sr1−xBaxSi2O2N2:Eu2+ phosphors were synthesized using high temperature solid state reaction. The effect of Ba incorporation on the structural and luminescence characteristics of SrSi2O2N2:Eu2+ phosphors were studied. The phosphors were crystallized in triclinic crystal structure and the cell volume increases monotonically with Ba addition. The PL emission peak wavelength red shifts with Ba up to x = 0.50 beyond which no red shift is observed. The XPS analysis shows that nitrogen is being incorporated into the host lattice along with Ba addition up to x = 0.50. The as synthesized phosphors show high thermal stability. Phosphor converted light emitting diodes were realized using Sr1−xBaxSi2O2N2:Eu2+ phosphors (x = 0 and x = 0.40) showing luminance efficacies of 108 and 101 lm W−1. The CIE chromaticity coordinates of Sr1−xBaxSi2O2N2:Eu (x = 0 and x = 0.40) phosphors.

show abstract

“…When the Eu 2+ concentration increased, the distance among the Eu 2+ ions became shorter, consequently leading to the increase in energy transfer within the Eu 2+ ions. Therefore, the increasing nonradiative energy transfer resulted in the red shift in emission wavelength 31 …”

Section: Resultsmentioning

confidence: 99%

Photoluminescent Properties and Energy Transfer Mechanism of Color‐Tunable CaSi₂O₂N₂:Ce³⁺, Eu²⁺ Phosphors

Hsu

Cheng

2011

Journal of the American Ceramic Society

View full text Add to dashboard Cite

31 and Eu 21 were prepared in this study. Broad Ce 31 excitation spectra ranging from 200 to 500 nm were found for Ca Si 2 O 2 N 2 :Ce 31 , Eu 21 phosphors. The emission bands consisted of Ce 31 and Eu 21 emission peaks. When the Eu 21 concentration increased, the emission intensity of Ce 31 decreased along with the enhancement in the Eu 21 emission intensity. The energy transfer from Ce 31 to Eu 21 occurred effectively in CaSi 2 O 2 N 2 : Ce 31 , Eu 21 with a dipole-dipole interaction. The increased Eu 21 concentration led the emitting colors of the prepared phosphor to shift from blue to green region. Increasing the temperature caused the emission intensity to decrease monotonously due to the thermal quenching effects.

show abstract

Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching

Cited by 47 publications

References 23 publications

Trap-controlled mechanoluminescent materials

Trap-controlled mechanoluminescent materials

Luminescence characteristics of Sr_1−xBa_xSi₂O₂N₂:Eu²⁺ phosphors for white light emitting diodes

Photoluminescent Properties and Energy Transfer Mechanism of Color‐Tunable CaSi₂O₂N₂:Ce³⁺, Eu²⁺ Phosphors

Contact Info

Product

Resources

About

Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching

Cited by 47 publications

References 23 publications

Trap-controlled mechanoluminescent materials

Trap-controlled mechanoluminescent materials

Luminescence characteristics of Sr1−xBaxSi2O2N2:Eu2+ phosphors for white light emitting diodes

Photoluminescent Properties and Energy Transfer Mechanism of Color‐Tunable CaSi2O2N2:Ce3+, Eu2+ Phosphors

Contact Info

Product

Resources

About

Luminescence characteristics of Sr_1−xBa_xSi₂O₂N₂:Eu²⁺ phosphors for white light emitting diodes

Photoluminescent Properties and Energy Transfer Mechanism of Color‐Tunable CaSi₂O₂N₂:Ce³⁺, Eu²⁺ Phosphors