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Srivastava S, Lee KE, Fitzgerald EA, Pennycook SJ, Gradečak S. Freestanding High-Resolution Quantum Dot Color Converters with Small Pixel Sizes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:48995-49002. [PMID: 36274221 DOI: 10.1021/acsami.2c14212] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Designing the next generation of high-resolution displays requires high pixel density per area and small pixel sizes without compromising the optical quality. Quantum dots (QDs) have been demonstrated as a promising material system for down-conversion of blue emission as they provide pure colors on the wide color gamut. However, for high color-conversion efficiency, the required QD film thickness has not been compatible with small pixel sizes. In this work, we develop a new type of freestanding QD-based color converter for efficient optical down-conversion from inorganic blue light-emitting diodes (LEDs) in a color-by-blue configuration. CdSe/ZnS core-shell QDs in a UV-curable polymer matrix are encapsulated within cavities formed by patterning and bonding a pair of patterned quartz substrates. By controlling the required QD thickness and the pixel size independently, we demonstrate freestanding monochrome red and green converters with small pixel sizes down to 5 × 5 μm2 and a high resolution of >3600 ppi. The optical studies show that the QD film thickness required for efficient color conversion can be successfully realized even for the small pixel sizes. We further combine green and red pixels in a single converter to achieve white emission when combined with blue LED emission. The QD color converter design and processing are decoupled from the LED fabrication and can be easily scaled to wafer-size integration with arbitrary pixel sizes for QD-based RGB displays with ultrahigh resolution.
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Affiliation(s)
- Saurabh Srivastava
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART), 1 Create Way, 138602 Singapore
- Institute of Materials Research and Engineering (IMRE), Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, 138634 Singapore
| | - Kenneth E Lee
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART), 1 Create Way, 138602 Singapore
| | - Eugene A Fitzgerald
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART), 1 Create Way, 138602 Singapore
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02141, United States
| | - Stephen J Pennycook
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART), 1 Create Way, 138602 Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
| | - Silvija Gradečak
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART), 1 Create Way, 138602 Singapore
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02141, United States
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
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Worku M, Tian Y, Zhou C, Lee S, Meisner Q, Zhou Y, Ma B. Sunlike White-Light-Emitting Diodes Based on Zero-Dimensional Organic Metal Halide Hybrids. ACS APPLIED MATERIALS & INTERFACES 2018; 10:30051-30057. [PMID: 30152995 DOI: 10.1021/acsami.8b12474] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here we report ultraviolet (UV)-pumped white-light-emitting diodes (WLEDs) with sunlike full spectrum emissions, by using a commercially available blue phosphor (BaMgAl10O17:Eu2+) and a series of broadband zero-dimensional (0D) organic metal halide hybrids as down conversion phosphors. By controlling the blend ratio of phosphors, we have achieved high-quality WLEDs with excellent general color rendering index (CRI Ra) of up to 99 and deep-red rendering index (R9) of up to 99. These WLEDs exhibiting white emissions with correlated color temperatures (CCTs) ranging from 3000 to 6000 K perfectly mimic sunlight at different times of day.
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Affiliation(s)
| | | | - Chenkun Zhou
- Department of Chemical and Biomedical Engineering , FAMU-FSU College of Engineering , Tallahassee , Florida 32310 , United States
| | - Sujin Lee
- Department of Chemical and Biomedical Engineering , FAMU-FSU College of Engineering , Tallahassee , Florida 32310 , United States
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Min BH, Jung KY. Synthesis and luminescence characteristics of fine-sized Ba3Si6O12N2:Eu green phosphor through spray pyrolysis using TEOS/Si3N4 mixed precursors. RSC Adv 2017. [DOI: 10.1039/c7ra08620b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A fine-sized Ba3Si6O12N2:Eu3+ green phosphor with good luminescence and thermal quenching properties was prepared by spray pyrolysis using a mixture of TEOS and Si3N4 nanoparticles as the Si precursor.
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Affiliation(s)
- Byeong Ho Min
- Department of Chemical Engineering
- Kongju National University
- Cheonan
- Republic of Korea
| | - Kyeong Youl Jung
- Department of Chemical Engineering
- Kongju National University
- Cheonan
- Republic of Korea
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