Green-emitting phosphor Na2Gd2B2O7:Ce3+, Tb3+ for near-UV LEDs

Guo, Chongfeng; Jing, Heng; Li, Ting

doi:10.1039/c2ra00808d

Cited by 64 publications

(41 citation statements)

References 18 publications

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“…Owing to their simple and low-cost fabrication along with high thermal and chemical stability as well as transparency over a wide spectral range (beginning from UV and extending into visible) 5,11 borate hosts are considered as potential candidates for many potential optoelectronic applications, particularly in the field of laser science and technology. 11 35 and NaSrBO 3 :Ce 3+ . 5 The aim of the present research is to develop borate (containing planar [BO 3 ] 3-groups) based phosphors having the quality of near white light emission, since borate hosts exhibited excellent thermal stability over the commercial YAG host, 5 and they are less moisture sensitive in nature than the usual oxyfluoride hosts.…”

Section: Introductionmentioning

confidence: 97%

KCa4(BO3)3:Ln3+ (Ln = Dy, Eu, Tb) phosphors for near UV excited white–light–emitting diodes

et al. 2013

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A series of doped KCa 4 (BO 3 ) 3 :Ln 3+ (Ln: Dy, Eu and Tb) compositions were synthesized by solid-state reaction method and their photoluminescent properties were systematically investigated to ascertain their suitability for application in white light emitting diodes. The X-ray diffraction (XRD) and nuclear magnetic resonance (MAS-NMR) data indicates that Ln 3+ -ions are successfully occupied the noncentrosymmetric Ca 2+ sites, in the orthorhombic crystalline phase of KCa 4 (BO 3 ) 3 having space group Ama2, without affecting the boron chemical environment. The present phosphor systems could be efficiently excitable at the broad UV wavelength region, from 250 to 350 nm, compatible to the most commonly available UV light-emitting diode (LED) chips. Photoluminescence studies revealed optimal near white-light emission for KCa 4 (BO 3 ) 3 with 5 wt.% Dy 3+ doping, while warm white-light (CIE; X = 0.353, Y = 0.369) is obtained at 1wt.% Dy 3+ ion concentration. The principle of energy transfer between Eu 3+ and Tb 3+ also demonstrates the potential white-light from KCa 4 (BO 3 ) 3 :Eu 3+ ,Tb 3+ phosphor. Whereas, single Tb 3+ and Eu 3+ -doped systems showed bright green (Tb 3+ ) and red (Eu 3+ ) emissions, respectively. Having structural flexibility along with remarkable chemical/thermal stability and suitable quantum efficiency these phosphors can be promising candidates as white-light-emitter for near UV LEDs.

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Section: Introductionmentioning

confidence: 97%

KCa4(BO3)3:Ln3+ (Ln = Dy, Eu, Tb) phosphors for near UV excited white–light–emitting diodes

et al. 2013

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“…This reduction is most likely due to the shorter bond lengths of Tb-O versus La-O bonds, similar to the explanation in the BaMgAl 10 O 17 :Eu system [16]. 470-650 nm are ascribed to f-f transitions of Tb 3+ [17,18]. The emission peak position of Ce 3+ slightly moved to the longer wavelength on increasing the Tb 3+ content, shown in the inset of Fig.…”

Section: Crystal Structure Of Lca:ce 3+ Hostmentioning

confidence: 54%

Color-tunable LaCaAl3O7:Ce3+,Tb3+ phosphors for UV light-emitting diodes

Shi

Zhu

Mikami

et al. 2013

Materials Research Bulletin

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“…However, as shown in Fig. 4 (a), the luminescence decay curves of Gd 3þ ions significantly deviate from the single exponential rule with the coactivation of Tb 3þ ions, which suggests the coactivation of Tb 3þ ions modify the luminescence dynamics of the Gd 3þ ions [16]. It is found that all the non-exponential curves can be well fitted by two exponentials.…”

Section: Energy Transfer Propertiesmentioning

confidence: 91%