AI Chat Paper
Note: Please note that the following content is generated by AMiner AI. SciOpen does not take any responsibility related to this content.
{{lang === 'zh_CN' ? '文章概述' : 'Summary'}}
{{lang === 'en_US' ? '中' : 'Eng'}}
Chat more with AI
Powered by AMiner. Clicking this button will take you away from SciOpen.
Home Journal of Advanced Ceramics Article
PDF (1.2 MB)
Cite
EndNote(RIS) BibTeX
Collect
Submit Manuscript AI Chat Paper
Show Outline
Outline
Show full outline
Hide outline
Outline
Show full outline
Hide outline
Research Article | Open Access

Fine-grained phosphors for red-emitting mini-LEDs with high efficiency and super-luminance

Yu KANGa, Shuxing LIb( ), Rundong TIANb, Guangzhu LIUa( ), Haorui DONGb, Tianliang ZHOUb, Rong-Jun XIEb,c( )
College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China
Fujian Provincial Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen 361005, China
State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
Show Author Information

Graphical Abstract

Abstract

Mini-LED backlights, combining color conversion materials with blue mini-LED chips, promise traditional liquid crystal displays (LCDs) with higher luminance, better contrast, and a wider color gamut. However, as color conversion materials, quantum dots (QDs) are toxic and unstable, whereas commercially available inorganic phosphors are too big in size to combine with small mini-LED chips and also have strong size-dependence of quantum efficiency (QE) and reliability. In this work, we prepare fine-grained Sr2Si5N8:Eu2+-based red phosphors with high efficiency and stability by treating commercially available phosphors with ball milling, centrifuging, and acid washing. The particle size of phosphors can be easily controlled by milling speed, and the phosphors with a size varying from 3.5 to 0.7 μm are thus obtained. The samples remain the same QE as the original ones (~80%) even when their particle size is reduced to 3.2–3.5 μm, because they contain fewer surface suspension bond defects. More importantly, SrBaSi5N8:Eu2+ phosphors show a size-independent thermal quenching behavior and a zero thermal degradation. We demonstrate that red-emitting mini-LEDs can be fabricated by combining the SrBaSi5N8:Eu2+ red phosphor (3.5 μm in size) with blue mini-LED chips, which show a high external quantum efficiency (EQE) of above 31% and a super-high luminance of 34.3 Mnits. It indicates that fine and high efficiency phosphors can be obtained by the proposed method in this work, and they have great potentials for use in mini-LED displays.

Keywords

Sr2Si5N8:Eu2+-based phosphorsparticle sizeexternal quantum efficiency (EQE)thermal degradationmini-LED

Electronic Supplementary Material

Download File(s)
40145_0617_ESM.pdf (1.1 MB)

References

[1]
Tan GJ, Huang YG, Li MC, et al. High dynamic range liquid crystal displays with a mini-LED backlight. Opt Express 2018, 26: 16572–16584.
Crossref Google Scholar
[2]
Huang YG, Tan GJ, Gou FW, et al. Prospects and challenges of mini-LED and micro-LED displays. J Soc Inf Display 2019, 27: 387–401.
Crossref Google Scholar
[3]
Huang YG, Hsiang EL, Deng MY, et al. Mini-LED, Micro-LED and OLED displays: Present status and future perspectives. Light Sci Appl 2020, 9: 105.
Crossref Google Scholar
[4]
Zhou X, He J, Liao LS, et al. Real-time observation of temperature rise and thermal breakdown processes in organic LEDs using an IR imaging and analysis system. Adv Mater 2000, 12: 265–269.
Crossref
[5]
So F, Kondakov D. Degradation mechanisms in small-molecule and polymer organic light-emitting diodes. Adv Mater 2010, 22: 3762–3777.
Crossref Google Scholar
[6]
Kirch A, Fischer A, Liero M, et al. Electrothermal tristability causes sudden burn-in phenomena in organic LEDs. Adv Funct Materials 2021, 31: 2106716.
Crossref Google Scholar
[7]
Hsiang EL, Yang Q, He ZQ, et al. Halo effect in high-dynamic-range mini-LED backlit LCDs. Opt Express 2020, 28: 36822–36837.
Crossref Google Scholar
[8]
Even A, Laval G, Ledoux O, et al. Enhanced in incorporation in full InGaN heterostructure grown on relaxed InGaN pseudo-substrate. Appl Phys Lett 2017, 110: 262103.
Crossref Google Scholar
[9]
Auf der Maur M, Pecchia A, Penazzi G, et al. Efficiency drop in green InGaN/GaN light emitting diodes: The role of random alloy fluctuations. Phys Rev Lett 2016, 116: 027401.
Crossref Google Scholar
[10]
Guo WJ, Chen N, Lu H, et al. The impact of luminous properties of red, green, and blue mini-LEDs on the color gamut. IEEE Trans Electron Devices 2019, 66: 2263–2268.
Crossref Google Scholar
[11]
Moon H, Lee C, Lee W, et al. Stability of quantum dots, quantum dot films, and quantum dot light-emitting diodes for display applications. Adv Mater 2019, 31: e1804294.
Crossref Google Scholar
[12]
Li SX, Wang L, Tang DM, et al. Achieving high quantum efficiency narrow-band β-sialon:Eu2+ phosphors for high-brightness LCD backlights by reducing the Eu3+ luminescence killer. Chem Mater 2018, 30: 494–505.
Crossref Google Scholar
[13]
Zhou TY, Hou C, Zhang L, et al. Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/ Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs. J Adv Ceram 2021, 10: 1107–1118.
Crossref Google Scholar
[14]
Xie RJ, Hirosaki N, Takeda T. Wide color gamut backlight for liquid crystal displays using three-band phosphor-converted white light-emitting diodes. Appl Phys Express 2009, 2: 022401.
Crossref Google Scholar
[15]
Wang L, Xie RJ, Suehiro T, et al. Down-conversion nitride materials for solid state lighting: Recent advances and perspectives. Chem Rev 2018, 118: 1951–2009.
Crossref Google Scholar
[16]
Zhou YY, Song EH, Deng TT, et al. Surface passivation toward highly stable Mn4+-activated red-emitting fluoride phosphors and enhanced photostability for white LEDs. Adv Mater Interfaces 2019, 6: 1802006.
Crossref Google Scholar
[17]
Brinkley SE, Pfaff N, Denault KA, et al. Robust thermal performance of Sr2Si5N8:Eu2+: An efficient red emitting phosphor for light emitting diode based white lighting. Appl Phys Lett 2011, 99: 241106.
Crossref Google Scholar
[18]
Hua H, Feng SW, Ouyang ZY, et al. YAGG:Ce transparent ceramics with high luminous efficiency for solid-state lighting application. J Adv Ceram 2019, 8: 389–398.
Crossref Google Scholar
[19]
Piao XQ, Horikawa T, Hanzawa H, et al. Characterization and luminescence properties of Sr2Si5N8:Eu2+ phosphor for white light-emitting-diode illumination. Appl Phys Lett 2006, 88: 161908.
Crossref Google Scholar
[20]
Yang YF, Chen JJ, Li GH, et al. Synthesis of nitride phosphor using entire oxides raw materials and their photoluminescence properties. J Am Ceram Soc 2017, 100: 1022–1029.
Crossref Google Scholar
[21]
Zeuner M, Hintze F, Schnick W. Low temperature precursor route for highly efficient spherically shaped LED-phosphors M2Si5N8:Eu2+ (M = Eu, Sr, Ba). Chem Mater 2009, 21: 336–342.
Crossref Google Scholar
[22]
Zeuner M, Schmidt PJ, Schnick W. One-pot synthesis of single-source precursors for nanocrystalline LED phosphors M2Si5N8:Eu2+ (M = Sr, Ba). Chem Mater 2009, 21: 2467–2473.
Crossref Google Scholar
[23]
Chen HR, Ju LC, Zhang L, et al. Exploring a particle-size-reduction strategy of YAG:Ce phosphor via a chemical breakdown method. J Rare Earths 2021, 39: 938–945.
Crossref Google Scholar
[24]
Liu YX, Wang H, Chen DY, et al. Achieving thermally stable and anti-hydrolytic Sr2Si5N8:Eu2+ phosphor via a nanoscale carbon deposition strategy. Ceram Int 2021, 47: 3244–3251.
Crossref Google Scholar
[25]
Kang T, Lee S, Kim T, et al. Efficient luminescence of Sr2Si5N8:Eu2+ nanophosphor and its film applications to LED and Solar cell as a downconverter. Sci Rep 2020, 10: 1475.
Crossref Google Scholar
[26]
Zhang JZ. Ultrafast studies of electron dynamics in semiconductor and metal colloidal nanoparticles: Effects of size and surface. Acc Chem Res 1997, 30: 423–429.
Crossref Google Scholar
[27]
Liu LH, Wang L, Li YQ, et al. Structural evolutions and significantly reduced thermal degradation of red-emitting Sr2Si5N8:Eu2+ via carbon doping. J Mater Chem C 2017, 5: 8927–8935.
Crossref Google Scholar
[28]
Yeh CW, Chen WT, Liu RS, et al. Origin of thermal degradation of Sr2−xSi5N8:Eux phosphors in air for light-emitting diodes. J Am Chem Soc 2012, 134: 14108–14117.
Crossref Google Scholar
[29]
Bizarri G, Moine B. On BaMgAl10O17:Eu2+ phosphor degradation mechanism: Thermal treatment effects. J Lumin 2005, 113: 199–213.
Crossref Google Scholar
[30]
Dwivedi J, Kumar P, Kumar A, et al. A commercial approach for the fabrication of bulk and nano phosphors converted into highly efficient white LEDs. RSC Adv 2014, 4: 54936–54947.
Crossref Google Scholar
[31]
Yim CJ, Unithrattil S, Chung WJ, et al. Comparative study of optical and structural properties of electrospun 1-dimensional CaYAl3O7:Eu3+ nanofibers and bulk phosphor. Mater Charact 2014, 95: 27–35.
Crossref Google Scholar
[32]
Zhu HL, Zhu EZ, Yang H, et al. High-brightness LaPO4:Ce3+,Tb3+ nanophosphors: Reductive hydrothermal synthesis and photoluminescent properties. J Am Ceram Soc 2008, 91: 1682–1685.
Crossref Google Scholar
[33]
Kolodiazhnyi T, Golberg D. Paramagnetic defects in boron nitride nanostructures. Chem Phys Lett 2005, 413: 47–51.
Crossref Google Scholar
[34]
Umeda T, Mochizuki Y, Miyoshi Y, et al. Charge-trapping defects in Cat-CVD silicon nitride films. Thin Solid Films 2001, 395: 266–269.
Crossref Google Scholar
[35]
Rebib F, Tomasella E, Aida S, et al. Influence of the structure of a-SiOxNy thin films on their electrical properties. Plasma Process Polym 2007, 4: S59–S63.
Crossref Google Scholar
Journal of Advanced Ceramics
Volume 11 Issue 9,
September 2022
Pages 1383-1390
DOI: 10.1007/s40145-022-0617-z
Cite this article:
KANG Y, LI S, TIAN R, et al. Fine-grained phosphors for red-emitting mini-LEDs with high efficiency and super-luminance. Journal of Advanced Ceramics, 2022, 11(9): 1383-1390. https://doi.org/10.1007/s40145-022-0617-z

1307

Views

135

Downloads

25

Crossref

25

Web of Science

25

Scopus

3

CSCD

Altmetrics
Received: 06 April 2022
Revised: 18 May 2022
Accepted: 25 May 2022
Published: 05 September 2022
© The Author(s) 2022.

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Return