A novel deep red emission phosphor BaAl2Ge2O8:Mn4+ for plant growth LEDs

Fu, Shihao; Tian, Lianhua

doi:10.1016/j.ijleo.2019.02.131

Cited by 16 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the red light at approximately 670 nm might meet the requirement of spectral energy for plant photosynthesis, and the light source in such range would be valuable for plant illumination. 45 The effects of Mn 4+ content on the photophysical properties have been evaluated in parallel experiments and MGS:xMn 4+ phosphors with x in the range between 0.1 and 3.0% have been recorded. In Figure 5a, the red emission was generated in the presence of Mn 4+ ions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Therefore, the improvement of WLED devices could be achieved by mixing the YAG:Ce component with Mn 4+ -doped oxides phosphors which would compensate with the red component in their emission spectrum. In addition, the red light at approximately 670 nm might meet the requirement of spectral energy for plant photosynthesis, and the light source in such range would be valuable for plant illumination …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

View full text Add to dashboard Cite

The substitution of metal sites in Mg 2 TiO 4 substrate leads to charge imbalance that will be closely related to a variety of changes including lattice structure, cell distortion, and photophysical properties. Herein, the co-substitution strategy of [Ga 3+ −Ga 3+ ] for [Mg 2+ −Ti 4+ ] and Sn 4+ for Ti 4+ achieves for the first time the novel Mg 3 Ga 2 SnO 8 (MGS):xMn 4+ (x = 0−3%) phosphors with efficient red emissions. In terms of X-ray powder diffraction (XRD) and Rietveld refinement analysis, MGS:Mn 4+ possesses a structure isotypic of Mg 2 TiO 4 in the cubic space group Fd3̅ m (227). There are two types of octahedra for Mn 4+ ions in this structure, where Ga 3+ ions completely occupy a group of octahedral sites and Mg 2+ /Sn 4+ has been randomly distributed over another group of octahedral sites. A strong excitation band in the broad spectral range (220− 550 nm) has been identified, thus facilitating the commercial uses for blue LED chips excitation. An intense red emission band at 680 nm has been observed due to the characteristic 2 E g − 4 A 2g transition of Mn 4+ ions. A concentration quenching effect occurs when the Mn 4+ content exceeds 1.5%, and the quenching mechanism is demonstrated to be dipole−quadrupole interactions. Temperature-dependent luminescence measurements support its good thermal stability, and the corresponding activation energy E a is determined to be 0.2552 eV. The possible luminous mechanism of the Mn 4+ ion is explained by the Tanabe−Sugano energy level diagram. The crystal field strength and the Racah parameters together with the nephelauxetic ratio are also determined for Mn 4+ in the MGS lattice. High color rendition warm white-lightemitting diodes (WLEDs) based on the optimal phosphor MGS:1.5%Mn 4+ ,1.5%Li + possess a color rendering index and color temperature of 85.6 and 3658 K, respectively. Its feasibility for application in solid-state white lighting has been verified.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

View full text Add to dashboard Cite

show abstract

“…As a result, the choice of phosphor holds the key to the success or failure of its factory. 3,[86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104] Figures 15e and 15f show the absorption spectra of phytochrome P FR and P R , respectively. Phytochromes regulate the photoblasty, the synthesis of chlorophyll, the elongation of seedlings, the size, shape and number, and movement of leaves, and the timing of flowering in adult plants.…”

Section: ) Inmentioning

confidence: 99%

Review—Photoluminescence Properties of Cr³⁺-Activated Fluoride Phosphors

Adachi

2021

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

The Cr3+-activated phosphor properties are discussed in detail from an aspect of spectroscopic point of view. The host materials considered here are a various kind of fluoride compounds. The photoluminescence (PL) and PL excitation spectra of such Cr3+-activated fluoride phosphors are analyzed based on Franck−Condon analysis within the configurational-coordinate model. A method is proposed for obtaining reliable crystal-field (Dq) and Racah parameters (B and C) based on a general ligand field theory with paying an attention to difficulty in the exact estimation of such important ligand field parameters. The intra-d-shell Cr3+ states, such as 2 Eg (2 G), T 2 g 4 (4 F), and T 1 g 4 (4 F), in various fluoride hosts are determined and plotted against Dq in the Tanabe−Sugano energy-level diagram. A comparative discussion of Cr3+ and Mn4+ as efficient activator ions for near-IR and red-emitting phosphors is given. Key properties of the Cr3+-activated fluoride phosphors are also presented for use of such near-IR or red-emitting fluoride phosphors in future light-emitting and related device applications.

show abstract

“…Moreover, the presence of deep-red light is also indispensable in plant lighting as chlorophyll a and b , red phytochrome P R , and far-infrared phytochrome P FR , which play a pivotal role in plant growth, exhibit strong absorption in the deep-red light region. , In plant growth, the utilization of blue-LED chips is favored over UV-LED chips, as the latter is generally detrimental to plant growth, while blue light is the main light source absorbed by plants except red light. Besides, studies have demonstrated that a combination of red and blue LED light can enhance photosynthesis in plants, fostering their growth and development. , Nevertheless, plenty of the reported red phosphors are excited at wavelengths less than 365 nm, − which are not favorable for plant growth. Therefore, there is a pressing need to explore efficient deep-red emitting phosphors that can be excited by different wavelengths (UV light and low-energy blue light) for diverse applications.…”

Section: Introductionmentioning

confidence: 99%

Multiwavelength Excitation in Ho³⁺-Doped All-Inorganic Double Perovskites Achieved by Codoping Mn²⁺ for Warm-White LEDs and Plant Growth

Zhu,

Sun,

Wang

et al. 2024

Inorg. Chem.

View full text Add to dashboard Cite

Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho 3+ -doped Cs 2 NaBiCl 6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho 3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn 2+ , apart from the characteristic emissions from Ho 3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn 2+ and a sharp emission peak at 657 nm from Ho 3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs 2 NaBiCl 6 to Mn 2+ and then from Mn 2+ to Ho 3+ . The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn 2+ overcomes the low absorption efficiency caused by f−f forbidden transitions of Ho 3+ . Finally, the diverse luminescent performance within the Cs 2 NaBiCl 6 :Ho 3+ , Mn 2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.

show abstract

A novel deep red emission phosphor BaAl2Ge2O8:Mn4+ for plant growth LEDs

Cited by 16 publications

References 28 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Review—Photoluminescence Properties of Cr³⁺-Activated Fluoride Phosphors

Multiwavelength Excitation in Ho³⁺-Doped All-Inorganic Double Perovskites Achieved by Codoping Mn²⁺ for Warm-White LEDs and Plant Growth

Contact Info

Product

Resources

About

A novel deep red emission phosphor BaAl2Ge2O8:Mn4+ for plant growth LEDs

Cited by 16 publications

References 28 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Review—Photoluminescence Properties of Cr3+-Activated Fluoride Phosphors

Multiwavelength Excitation in Ho3+-Doped All-Inorganic Double Perovskites Achieved by Codoping Mn2+ for Warm-White LEDs and Plant Growth

Contact Info

Product

Resources

About

Review—Photoluminescence Properties of Cr³⁺-Activated Fluoride Phosphors

Multiwavelength Excitation in Ho³⁺-Doped All-Inorganic Double Perovskites Achieved by Codoping Mn²⁺ for Warm-White LEDs and Plant Growth