Multi-primary-color quantum-dot down-converting films for display applications

Lin, Shuyan; Tan, Guanjun; Yu, Jia; Chen, Enguo; Weng, Yalian; Zhou, Xiongtu; Xu, Sheng; Ye, Yun; Yan, Qun; Guo, Tailiang

doi:10.1364/oe.27.028480

Cited by 51 publications

(29 citation statements)

References 48 publications

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“…In another work involving perovskite QDs Lin and co-workers reported 158.93% of NTSC and 118.60% of Rec. 2020 respectively 25 . However, there are no reports of QDCF type devices with InP based quantum dots showing high performances described here.…”

Section: Resultsmentioning

confidence: 99%

Environmentally friendly quantum-dot color filters for ultra-high-definition liquid crystal displays

Prabhakaran

Choi

et al. 2020

Sci Rep

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This work reports the synthesis and application of highly tuned cadmium-free green and red InPZnSe1−xSx/ZnS quantum dots (QDs) in QD enhanced liquid crystal displays (LCD). The emissions of the quantum dots were synthetically tuned to sharp emissions at low full-width at half maximum. The QDs were incorporated in LCD devices as quantum dot enhancement film (QDEF) or as a quantum dot incorporated color filter (QDCF). Synthetic tuning of the gradient inter-shell in the QDs leads to reduced full width at half-maximum, resulting in sharp green and red emissions from both types of devices. The application of the same QDs to devices using these different integration techniques shows the superiority of QDCF devices over QDEF ones. The RGB color gamut of a QDCF-LCD was 81.4% of REC.2020 in the CIE 1931 color space compared to 71.2% obtained for a QDEF-LCD display. The improved performance of QDCF was mainly due to the optimal interactions between the green QDs and the green color filter. The superior performance of cadmium-free InPZnSe1−xSx/ZnS QDCFs in LCDs make them well-suited for ultra-high-definition TV formats.

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Section: Resultsmentioning

confidence: 99%

Environmentally friendly quantum-dot color filters for ultra-high-definition liquid crystal displays

Prabhakaran

Choi

et al. 2020

Sci Rep

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“…For the experimental verification, photolithography technology was used to fabricate the three primary-color subpixels of the designed QDCCF. The photolithography process has been demonstrated to be an effective method for high-precision pixelation of QDCCF. ,,, During the experiment, four independent photomasks were prepared for the three primary-color subpixels and the black matrix, respectively. Figure a–c shows the microscopic images of the photomasks for the black matrix and the red and green subpixel arrays, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…White balance is an indispensable performance index for both backlight modules and direct displays. The initial approach for achieving white balance in backlights is to use a phosphor layer made of yttrium aluminum garnet excited by a gallium nitride light-emitting diode (LED) with the wavelength between 450 and 470 nm. , However, a broad emission spectrum and the large particle size of phosphor materials limit their future application in emerging displays, such as mini- or micro-LEDs. − The display color reproduction relying on absorptive color filters has two limitations, including overlapped spectral emission and color crosstalk. , For solving these problems, the cost will be efficiency loss or color gamut shrink. − Target white balance from absorptive color filters can be achieved with the same intensity transmitted through the three primary-color subpixels, because the display brightness of each subpixel can be tuned by a thin film transistor array. Therefore, the stripe arrangement of the subpixels with a fixed size of each subpixel’s aperture is commonly used in current white-balance displays. ,− …”

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confidence: 99%

Asymmetric Quantum-Dot Pixelation for Color-Converted White Balance

et al. 2021

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Pixelated quantum-dot color conversion film (QDCCF) is attractive for next-generation, high-pixel-density, full-color displays. However, how to achieve white balance of these QD converted displays puts forward a new challenge, because the final light-emitting area is redefined by the apertures of the QD formed subpixels. Based on this, this paper presents an effective white-balance realization approach by precisely defining an asymmetric aperture ratio among three primary-color subpixels of the QDCCF. Based on the measured photoluminescence characteristic of quantum-dot photoresist (QDPR), the theoretical aperture ratio can be derived by the spectral radiation energy and external quantum efficiency (EQE) of QDCCFs for the target D65 white-balance state. A bilayered device architecture, combining a blue mini-LED backlight and a pixelated QDCCF, was simulated and experimentally assembled to verify the theoretical design. The simulated chromatic coordinates obtained from the QDCCF precisely agree with the target white-balance point. Experimental patterning and pixelation of the designed QDCCF were achieved by a precise photolithography process. Measured results show that a white-light output was achieved with the chromatic coordinates of (0.2822, 0.2951) and the color gamut of 115.09% NTSC (National Television System Committee) standard. The deviation of the experimental chromatic coordinates is within ±0.05 to the D65 standard light source. The proposed white-balance realization approach featured by the aperture adjustable subpixels of a chromatic QDCCF may open up a new route for color reproduction in emerging display technologies.

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“…The IERBM with α = 89.5 °and L = 20 µm is used for further discussion. A white-balanced QDCCF commonly contains separate three-primary-color or multi-primary-color sub-pixels that are aligned with the bottom blue µLED array [17,49]. The results in Fig.…”

Section: B White Balance Realizationmentioning

confidence: 99%

Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

et al. 2022

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Quantum-dot color conversion film (QDCCF) with a partitioned black matrix (BM) realizes effective color generation with low crosstalk for micro-light-emitting diode (μLED) displays. However, this traditional BM seriously deteriorates light conversion efficiency (LCE) of QD converted μLED displays due to its absorption energy loss. In this paper, a novel internal and external reflective black matrix (IERBM) is proposed to improve the LCE and blue light utilization (BLU) by light recycling and reuse. Based on the IERBM structural optimization, the LCE can be respectively improved by 3.39× and 2.74× for red and green QDCC sub-pixels, and the BLU can be effectively increased by 1.11×. Accurate white balance and high color uniformity are achieved by this μLED display. Meanwhile, both the crosstalk of 1.72% and the color gamut of 89.8% Rec. 2020 are comparable with traditional absorptive BM. It is also found that the proposed IERBM has the potential to weaken μLED's sidewall effect. This work may open up a new technological route for improving the optical performance in advanced self-emissive displays.

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Multi-primary-color quantum-dot down-converting films for display applications

Cited by 51 publications

References 48 publications

Environmentally friendly quantum-dot color filters for ultra-high-definition liquid crystal displays

Environmentally friendly quantum-dot color filters for ultra-high-definition liquid crystal displays

Asymmetric Quantum-Dot Pixelation for Color-Converted White Balance

Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

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