P‐121: Sub‐micrometre Phosphor Preparation for Next Generation Displays

Fern, George R.; Harris, Paul G.; Ireland, Terry G.; Silver, Jack

doi:10.1002/sdtp.11996

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…As shown in Fig. 2(b), the relative aperture size of the IERBM and QDCCF can be expressed by b q L r L  (7) where Lb and Lq are the top side length of the IERBM and the QDCCF, respectively.…”

Section: Performance Indicatorsmentioning

confidence: 99%

“…For liquid crystal displays, white light from the backlight is firstly generated by blue LEDs and the capped yellow phosphors, and then three primary colors are separated by an absorptive color filter [4][5][6]. The combination of phosphors and color filter inevitably brings narrow color gamut and low optical efficiency, which is antithetical to the requirements of next-generation displays [7][8]. As a potential game changer, quantum dots (QDs) have become a new research hotspot, which show the advantages of high efficiency, wide color gamut, satisfactory optical purity, adjustable color spectrum, and so on [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Performance Indicatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…For simulation of the phosphor photoluminescence, their absorption spectrum, color conversion efficiency, and emission spectrum are all taken into account during calculations . The phosphor particle size in the simulation is set to vary from 0.25 μm to 5 μm because of the small pixel size . And, the thickness of funnel tube was set to be h = 30 μm according to the optical density of the phosphor.…”

Section: Device Structurementioning

confidence: 99%

“…11,12 The phosphor particle size in the simulation is set to vary from 0.25 μm to 5 μm because of the small pixel size. 13 And, the thickness of funnel tube was set to be h = 30 μm according to the optical density of the phosphor. The concentrations of green and red phosphors are adjusted to obtain a white balance for the display system.…”

Section: Introductionmentioning

confidence: 99%

High performance color‐converted micro‐LED displays

et al. 2019

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A full‐color micro‐LED display can be achieved by red, green, and blue (RGB) chips or by a blue/ultraviolet (UV) micro‐LED array to pump downconverters. The latter helps relieve the burden of epitaxial growth of tri‐color micro‐LED chips. However, such a color‐converted micro‐LED system usually suffers from color crosstalk and low efficiency due to limited optical density of color converters. With funnel‐tube array and reflective coating on its inner surface, the crosstalk is eliminated, and the optical efficiency can be improved by more than two times. In addition, the ambient contrast ratio is also improved because of higher light intensity. The color gamut of this device is approximately 92% of DCI‐P3 standard.

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“…The absorption spectrum, color conversion efficiency, and emission spectrum are all taken into account during calculations (Figure 2a). Because of the small pixel size, the phosphor particle size in the simulation is set to vary from 0.25 µm to 5 µm [12]. The refractive index of phosphor is 1.8 at all wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Tripling the Optical Efficiency of Color-Converted Micro-LED Displays with Funnel-Tube Array

et al. 2019

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Color-converted micro-LED displays consist of a mono-color micro-LED array and color conversion materials to achieve full color, while relieving the burden of epitaxial growth of three-color micro-LEDs. However, it usually suffers from low efficiency and color crosstalk due to the limited optical density of color conversion materials. With funnel-tube array, the optical efficiency of the color-converted micro-LED display can be improved by ~3X, while the crosstalk is eliminated. After optimization of the tapper angle, the ambient contrast ratio is also improved due to higher light intensity.

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P‐121: Sub‐micrometre Phosphor Preparation for Next Generation Displays

Abstract: A method for preparing sub-micrometre phosphor particles is discussed in relation to the physical and electronic properties and it is shown that the particle size of less than 1um has significant luminous efficacy.

Cited by 5 publications

References 3 publications

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

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

High performance color‐converted micro‐LED displays

Tripling the Optical Efficiency of Color-Converted Micro-LED Displays with Funnel-Tube Array

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