Efficient hybrid white light-emitting diodes by organic-inorganic materials at different CCT from 3000K to 9000K

Chen, Kuo Ju; Lai, Yi Chun; Lin, Bin Cheng; Lin, Chien Chung; Chiu, Sheng Huan; Tu, Zong Yi; Shih, Min‐Hsiung; Yu, Peichen; Lee, Po Tsung; Li, Xiuling; Meng, Hsin Fei; Chung, Gou; Chen, Teng Ming; Kuo, Hao Chung

doi:10.1364/oe.23.00a204

Cited by 19 publications

(13 citation statements)

References 30 publications

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“…In general, LEDs were recognized as one kind of the economical and efficient solid-state lighting sources [1,2]. In order to achieve high color rendition (Ra > 80) of white LEDs, the component ratio of green light and red light should be larger.…”

Section: Introductionmentioning

confidence: 99%

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Li¹,

Zang²,

Chen³

et al. 2016

Opt. Express

163

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All-inorganic perovskite CsPbBr₃ quantum dots (QDs) with an emission peak of around 520 nm were synthesized by a hot-injection method, and were systematically studied as green phosphor for light-emitting diodes (LEDs). Highly pure green light with an emission peak of 534 nm and a full-width at half-maximum (FWHM) about 20 nm was achieved using CsPbBr₃ QDs and GaN LEDs. Commission Internationale Ed I'Eclairage coordinate of the fabricated green LEDs was (0.203, 0.757). Compared to GaN LEDs, the current-voltage characteristic of the green LED did not show any degradation. Moreover, the green LEDs displayed a luminous efficiency of 31.92 lm/W under an injection current of 10 mA.

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Section: Introductionmentioning

confidence: 99%

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Li¹,

Zang²,

Chen³

et al. 2016

Opt. Express

163

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“…When compared to the inorganic nanocrystal, or quantum dots, they are both competitive for the future generation of light sources because of their good quantum yields. In our previous work, the blue polyfluorene seems to be promising in terms of good quantum yield demonstrated [28].…”

Section: Introductionmentioning

confidence: 96%

Excellent Color Quality of White-Light-Emitting Diodes by Embedding Quantum Dots in Polymers Material

Lin

Wang

Lin

et al. 2016

IEEE J. Select. Topics Quantum Electron.

Self Cite

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This study employs the polyfluorene composite (called Green B) with several colors of quantum dots to generate the highcolor-rendering index (CRI) white LEDs. The Green B polymer is a good candidate to manufacture the hybrid w-LED because of its good quantum efficacy. The hybrid w-LEDs are fabricated by the mixing of Green B with yellow quantum dots and red quantum dots or orange quantum dots to obtain the correlated color temperatures of 3500 and 5500 K. The use of the hybrid polymer/QDs w-LEDs is proved to be beneficial as QD w-LEDs can improve the CRI up to 90 in 3500 K. The luminous efficiency of such devices can be as high as 17.2l m/W. Index Terms-Light-emitting diodes (LEDs), quantum dots (QDs).

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“…The results from their study showed that CaF2-YAG:Ce phosphor ceramic increase the optical performance of WLEDs, specifically, the increased luminous flux, CCT and CRI are 359.7 lm, 4021-7941 K and 70.1-82.7, respectively. The potential to boost the effectiveness of these nanoparticles is high as they are compact and flexible which open directions for alterations yet there are not many manuscripts on utilizing nanoparticles in a creative structure as most research concentrate on how WLEDs react to the particles [22][23][24]. In the meantime, because of the lack of concentrated speculations and complex specialized direction, choosing an optimal nanoparticles material to effectively enhance the CCT is quite confusing and repetitive, especially for manufacturers.…”

Section: Introductionmentioning

confidence: 99%

The Effects of ZnO particles on the color homogeneity of phosphor-converted high-power white LED light sources

Loan

Anh

2020

IJECE

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Color homogeneity is one of the goals to continuously improve WLED. Among the methods for enhancing the color uniformity of WLEDs, improving scattering in phosphor layer is considered to be the most effective. In this paper, ZnO is used for that purpose. The results show that ZnO particle size significantly affects scattering in the phosphor layer, which is a vital factor to analyze scattering, scattering sand surface, scattering coefficient and scattered phase function C_sca (D,λ), μ_sca (λ) and ρ(θ,λ). In addition, the concentration of ZnO was also analyzed with values from 2% to 22%. Color homogeneity depends not only on size but also on the concentration of added ZnO. Therefore, color homogeneity control is the control of ZnO size and concentration. The proposed result is 10% ZnO for the highest lumen of LED. With 14% and 500 nm of ZnO particles, ΔCCT reaches the lowest. Depending on the production needs, manufacturers can choose the most appropriate way. However, with both required lumen and ΔCCT, 14% ZnO is suitable for ZnO sizes.

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Efficient hybrid white light-emitting diodes by organic-inorganic materials at different CCT from 3000K to 9000K

Cited by 19 publications

References 30 publications

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Excellent Color Quality of White-Light-Emitting Diodes by Embedding Quantum Dots in Polymers Material

The Effects of ZnO particles on the color homogeneity of phosphor-converted high-power white LED light sources

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