Brownish red emitting YAG:Ce3+,Cu+ phosphors for enhancing the color rendering index of white LEDs

Zhao, Cong; Zhu, Daoben; Ma, Minglin; Han, Tao; Ming-jing, TU

doi:10.1016/j.jallcom.2012.01.131

Cited by 45 publications

(11 citation statements)

References 36 publications

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“…3,4,8,9 At present, commercial WLEDs are mainly fabricated by the combination of blue LED chips and the yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) phosphor. [3][4][5][7][8][9][10][11][12] However, because the main emission of YAG:Ce is in the greenish yellow region, such WLEDs show a low color rendering index (CRI) and high correlated color temperature (CCT) due to the lack of red light component in their spectra. 7,[13][14][15][16][17] There are mainly two approaches to overcome these drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

et al. 2015

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“…Phosphors have been extensively investigated to meet the ever-increasing requirements in lighting technology since Nakamura et al [1] invented the white light-emitting diodes (w-LEDs). As the key material for preparing w-LEDs, many kinds of phosphors have been explored [2][3][4][5][6][7][8][9][10][11], such as silicates, aluminates, sulfides, phosphates, nitrogen-oxides, oxides and nitrides.…”

Section: Introductionmentioning

confidence: 99%

The effect of doping La3+ on structure and luminescent properties of Sr2SiO4:Eu2+ phosphors

Zhao

Zhu

et al. 2015

Ceramics International

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“…Compared with those of Ba 2 P 2 O 7 :Ce 3+ ,Tb 3+ phosphors, the excitation peaks of Ba 2 P 2 O 7 :Eu 2+ ,Tb 3+ shift from 260 nm to 240 nm and from 280 nm to 260 nm. This phenomenon results from the doping of Eu 2+ ions, which changes the crystal field environment and affects the vibrational level of the electrons in the outer shell . Additionally, although the radii of Ce 3+ and Eu 2+ are both compatible with the ionic radius of Ba 2+ , doping of these rare‐earth ions with different radii are considered to locate at different types of Ba1 or Ba2 lattice sites randomly, which may influence the electron transition and the optical properties of phosphors .…”

Section: Resultsmentioning

confidence: 99%

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

et al. 2017

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Abstractpoor color rendering index and low stability of CCT. [1,4] Given that issue, it is necessary to explore single-phase white emissive phosphors for application in w-LEDs.Numerous efforts have previously been made to develop codoped single-phase white-emitting phosphors. [5,6] However, with the tri-doped phosphor it is easier to achieve tri-chromatic (RGB) emission with complete coverage when compared with co-doped phosphors. It is well known that the mixture of RGB emissions is more beneficial to generate an ideal warm white-light emission according to trichromatic theory. [7] Hence, more researchers have devoted themselves to developing the more complex tri-doped single-phase white-emitting phosphors. For example, Jiang and colleagues [8] It is a known reality that most phosphors are prepared via a conventional solid-state route, which has unavoidable disadvantages such as high synthesis temperature, nonhomogeneous mixtures and uncontrollable morphology. In particular, the obtained particles are very large with sizes in the range 1-10 μm. [9,10] In recent years, more researchers have focused on the co-precipitation method, which can overcome the above disadvantages and obtain nanophosphors with excellent luminescence properties. [9][10][11][12][13][14] Among these, Yi and colleagues [15] short, the co-precipitation method is very safe, energy-saving, timesaving option.At present, the most common hosts are aluminate and silicate systems with high stability and high QE. [16] But their synthesis conditions are harsh, in particular the synthesis temperatures are often as high as 1300°C. [17] Other materials, such as tungsten phosphate and rare earth oxides, can be easily synthesized, however they are chemically instable.[18] Barium pyrophosphate is a promising host for luminescent materials due to its low sintering temperature and stability. [18][19][20] Among the trivalent rare earth ions, Tb 3+ ion has been used frequently as the green emission center owing to its predominant 5 D 4 ! 7 F 5 transition with a peak centered at 545 nm. However, because of the forbidden transition and the weak absorption of Tb 3+ ion in the NUV region, the emission efficiency is low. [20,21] As is well known, Ce 3+ and Eu 2+ are often considered as the most important activator and effective sensitizer for Tb 3+ because of their unique electronic energy levels. [22][23][24][25] To the best of our knowledge, the crystal structures and lumines- | CharacterizationThe crystal phase of phosphor sample was analyzed by a SHIMADZU XRD-6000 diffractometer (Shimadzu Co., Japan) with Ni-filtered Cu single-phase. Ba 2 P 2 O 7 crystallized as a hexagonal structure with a space group p-62m and the lattice parameters were determined to be a = b = 9.415Å, c = 7.078Å, the crystal structure diagram of which is presented in Figure 2(a). The hexagonal form of Ba 2 P 2 O 7 signified that the sample host was at a higher temperature phase as σ-Ba 2 P 2 O 7 .Ba ions have two different types of coordination environments, in which one is coordinated b...

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Brownish red emitting YAG:Ce3+,Cu+ phosphors for enhancing the color rendering index of white LEDs

Cited by 45 publications

References 36 publications

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

The effect of doping La3+ on structure and luminescent properties of Sr2SiO4:Eu2+ phosphors

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

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Brownish red emitting YAG:Ce3+,Cu+ phosphors for enhancing the color rendering index of white LEDs

Cited by 45 publications

References 36 publications

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

The effect of doping La3+ on structure and luminescent properties of Sr2SiO4:Eu2+ phosphors

Luminescent properties of single‐phase Ba2‐x‐1.5y‐1.5zP2O7:xEu2+,yCe3+, zTb3+ phosphors for white light‐emitting diode

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Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode