一种新型高效的多层荧光粉层白光led封装结构

Li, Baicheng; Zhang, Dawei; Huang, Yuanshen; Zhang, Ni; Zhuang, Songlin

doi:10.3788/col20100802.0221

Cited by 14 publications

(2 citation statements)

References 7 publications

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“…It can be inferred from (4) that the energy of the field splitting depends significantly on the cation-ligand bond length. Subsequently, based on double exponential function, the corresponding decay times (τ1 and τ2) of phosphor luminescence are measured using (5) [23];…”

Section: Resultsmentioning

confidence: 99%

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

Doan Duy,

Hanh Nguyen Thi,

Thinh Nhan

2023

IJEECS

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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.

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Section: Resultsmentioning

confidence: 99%

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

Doan Duy,

Hanh Nguyen Thi,

Thinh Nhan

2023

IJEECS

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“…Color rendering index (CRI) can reach above 90 in any color temperature region from 2700 to 13000 K by matching the ratio of red and green phosphors and silica gel [1] . The light-extraction efficiency of LEDs has been improved by double-layer or multi-layer phosphor package structures [2] . The multichip RGB approach allows for high color rendering, chromaticity-point stabilization, and color adjustment [3−5] .…”

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confidence: 99%

不同驱动电流下的led光谱模型

He¹,

Zheng²

2010

Chin. Opt. Lett.

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A mathematical model for the spectra of monocolor light-emitting diodes (LEDs) and phosphor-coated white LEDs at different drive currents is established. The simulation program of the color rendering of a white light LED cluster is developed based on this model. The program can predict not only the spectral power distribution and color rendering index (CRI), but also the number of LEDs, drive currents, input power, and luminous efficacy of a white light LED cluster at a given color temperature according to the requirement of the luminous flux. The experimental results show that the relative spectral power distributions (SPDs) and chromaticity coordinates of the model LED are very close to that of the real LED at different drive currents. Moreover, the correlated color temperature (CCT), CRI, special color rendering index (R9) luminous flux, input power, and luminous efficacy of the white light LED cluster predicted by simulation are also very close to the measured values. Furthermore, a white/red cluster with high rendering (CCT = 2903 K, CRI = 91.3, R9 = 85) and a color temperature tunable warm-white/red/green/blule LED cluster with high rendering (CCT = 2700−6500 K, CRI > 90, R9 > 96) are created.

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