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Recent Advances in Encapsulation Materials for Light Emitting Diodes: a Review

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Abstract

Light emitting diodes (LEDs) as the emerging green light sources are of great significance to achieve the energy saving and emission reduction. The encapsulation materials as the key supporting and protection materials can directly influence the reliability, performance, and service life of LEDs. Thus, the encapsulation materials with ideal properties including high transmittance, high refractive index (RI), excellent mechanical property, high thermal conductivity, and high aging resistance are urgently needed in the LEDs-based semiconductor lighting field. Epoxy resins and organic silicone resins as the main two traditional encapsulation materials still have some problems, such as low RI, poor mechanical property, prone to yellowing, easy to aging, and so on. To overcome these problems, numerous researches were conducted to improve the overall performances of epoxy resins and organic silicone resins for LED encapsulation. Especially, the organic-inorganic nanocomposite materials can combine the advantages of inorganic nanoparticles and organic resins and show excellent performance for LED encapsulation, hence drawing more and more attention. This review will summarize the recent development of epoxy resin materials, organic silicone materials, and organic-inorganic nanocomposite materials for LED encapsulation, and outlook the key problems and future development direction of the LED encapsulation industry.

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References

  1. Hamidnia M, Luo Y, Wang XD (2018) Application of micro/nano technology for thermal management of high power LED packaging-a review. Appl Therm Eng 145:637–651

    Article  CAS  Google Scholar 

  2. Kalyani NT, Dhoble SJ (2012) Organic light emitting diodes: energy saving lighting technology-a review. Renew Sust Energy Rev 16:2696–2723

    Article  Google Scholar 

  3. Wu BS, Hitti Y, MacPherson S, Orsat V, Lefsrud MG (2020) Comparison and perspective of conventional and LED lighting for photobiology and industry applications. Environ Exp Bot 171:103953

    Article  Google Scholar 

  4. Alim MA, Abdullah MZ, Aziz MSA, Kamarudin R (2021) Die attachment, wire bonding, and encapsulation process in LED packaging: a review. Sens Actuators A 329:112817

    Article  CAS  Google Scholar 

  5. Deng Z, Wang M, Zhu C, Li C, Liu J, Tu M, Xie L, Gui D (2019) Study on light aging of anhydride-cured epoxy resin used for RGB LED packaging material. Polym Test 80:106131

    Article  CAS  Google Scholar 

  6. Zhan X, Zhang J, Wang X, Cheng J (2012) Progress on silicone packaging materials for power LED. Procedia Eng 27:687–692

    Article  Google Scholar 

  7. Chen Z, Liu Z, Shen G, Wen R, Lv J, Huo J, Yu Y (2016) Effect of chain flexibility of epoxy encapsulants on the performance and reliability of light-emitting diodes. Ind Eng Chem Res 55:7635–7645

    Article  CAS  Google Scholar 

  8. Tang B, Liu X, Zhao X, Zhang J (2014) Highly efficient in situ toughening of epoxy thermosets with reactive hyperbranched polyurethane. J Appl Polym Sci 131:40614

    Article  Google Scholar 

  9. Ma S, Liu W, Gao N, Yan Z, Zhao Y (2011) Synthesis and properties of LED-packaging epoxy resin toughened by a novel polysiloxane from hydrolysis and condensation. Macromol Res 19:972–979

    Article  CAS  Google Scholar 

  10. Liu Y, Luan X, Feng Y, Tan X, Han Y, Sun X (2018) Self-adhesive epoxy modified silicone materials for light emitting diode encapsulation. Polym Adv Technol 28:1473–1479

    Article  Google Scholar 

  11. Tong L, Feng Y, Sun X, Han Y, Jiao D, Tan X (2018) High refractive index adamantane-based silicone resins for the encapsulation of light-emitting diodes. Polym Adv Technol 29:2245–2252

    Article  CAS  Google Scholar 

  12. Kim Y, Kim S, Iqbal F, Yie H, Kim H (2015) Effect of transmittance on luminescence properties of phosphor-in-glass for LED packaging. Opt Express 23:A43–A50

    Article  CAS  PubMed  Google Scholar 

  13. Ru Y, Zhang X, Wang L, Dai L, Yang W, Qiao J (2015) Polymer composites with high haze and high transmittance. Polym Chem 6:6632–6636

    Article  CAS  Google Scholar 

  14. Arik M, Becker CA, Weaver SE, Petroski J (2004) Thermal management of LEDs: package to system. Proc SPIE 5187:64–75

    Article  CAS  Google Scholar 

  15. Yung KC, Liem H, Choy HS (2013) Heat dissipation performance of a high-brightness LED package assembly using high-thermal conductivity filler. Appl Opt 52:8484–8493

    Article  CAS  PubMed  Google Scholar 

  16. Park BG, Myung WR, Lee CJ, Jung SB (2020) Mechanical, electrical, and thermal reliability of Sn-58wt.% bi solder joints with ag-decorated MWCNT for LED package component during aging treatment. Composites Part B 182:107617

    Article  CAS  Google Scholar 

  17. Zhao X, Hou Z, Wang B, Shen Q, Jia H, Zhang A, Liu X, Xu B (2017) Synthesis, luminance and ultraviolet resistance of a copolymer phosphor of Eu-complex and siloxane in near UV-based LED. Res Chem Intermed 43:4129–4143

    Article  CAS  Google Scholar 

  18. Wen R, Huo J, Lv J, Liu Z, Yu Y (2017) Effect of silicone resin modification on the performance of epoxy materials for LED encapsulation. J Mater Sci Mater Electron 28:14522–14535

    Article  CAS  Google Scholar 

  19. Chung PT, Yang CT, Wang SH, Chen CW, Chiang AST, Liu CY (2012) ZrO2/epoxy nanocomposite for LED encapsulation. Mater Chem Phys 136:868–876

    Article  CAS  Google Scholar 

  20. Gao N, Liu WQ, Ma SQ, Tang C, Yan Z (2012) Cycloaliphatic epoxy resin modified by two kinds of oligo-fluorosiloxanes for potential application in light-emitting diode (LED) encapsulation. J Polym Res 19:1–10

    Article  Google Scholar 

  21. Hsieh TH, Kinloch AJ, Taylor AC, Sprenger S (2011) The effect of silica nanoparticles and carbon nanotubes on the toughness of a thermosetting epoxy polymer. J Appl Polym Sci 119:2135–2142

    Article  CAS  Google Scholar 

  22. Ladani RB, Wu S, Kinloch AJ, Ghorbani K, Zhang J, Mouritz AP, Wang CH (2015) Improving the toughness and electrical conductivity of epoxy nanocomposites by using aligned carbon nanofibres. Compos Sci Technol 117:146–158

    Article  CAS  Google Scholar 

  23. Salom C, Prolongo MG, Toribio A, Martínez-Martínez AJ, de Cárcer IA, Prolongo SG (2018) Mechanical properties and adhesive behavior of epoxy-graphene nanocomposites. Int J Adhes Adhes 84:119–125

    Article  CAS  Google Scholar 

  24. Wu Z, Wang M, Wang Z (2015) The gas phase SiO2/epoxy nanocomposites with enhanced mechanical and thermal properties. High Perform Polym 27:469–475

    Article  CAS  Google Scholar 

  25. Sun Y, Liu W, Tan J, Wang H (2016) Nano-and micro-structured random copolymer modified cycloaliphatic epoxy resins for use as light-emitting diode encapsulation. J Macromol Sci Part A 53:201–209

    Article  CAS  Google Scholar 

  26. Gao N, Liu WQ, Ma SQ, Yan ZL, Zhao Y (2012) Modification of epoxy resin with cycloaliphatic-epoxy oligosiloxane for light-emitting diode (LED) encapsulation application. J Macromol Sci Part B 51:1509–1524

    Article  CAS  Google Scholar 

  27. Liu J, Ueda M (2009) High refractive index polymers: fundamental research and practical applications. J Mater Chem 19:8907–8919

    Article  CAS  Google Scholar 

  28. Higashihara T, Ueda M (2015) Recent progress in high refractive index polymers. Macromolecules 48:1915–1929

    Article  CAS  Google Scholar 

  29. Luo C, Zuo J, Zhao J (2013) Synthesis and property of epoxy prepolymer and curing agent with high refractive index. High Perform Polym 25:986–991

    Article  Google Scholar 

  30. Luo C, Zuo J, Wang F, Yuan Y, Lin F, Huang H, Zhao J (2016) High refractive index and flame retardancy of epoxy thermoset cured by tris (2-mercaptoethyl) phosphate. Polym Degrad Stab 129:7–11

    Article  CAS  Google Scholar 

  31. Chen G, Zhang Q, Hu Z, Wang S, Wu K, Shi J, Liang L, Lu M (2019) Liquid crystalline epoxies bearing biphenyl ether and aromatic ester mesogenic units: synthesis and thermal properties. J Macromol Sci Part A 56:484–495

    Article  CAS  Google Scholar 

  32. Zhang Q, Chen G, Wu K, Shi J, Liang L, Lu M (2020) Biphenyl liquid crystal epoxy containing flexible chain: synthesis and thermal properties. J Appl Polym Sci 137:e49143

    Article  Google Scholar 

  33. Yang X, Zhu J, Yang D, Zhang L, Guo Y, Zhong X, Kong J, Gu J (2020) High-efficiency improvement of thermal conductivities for epoxy composites from synthesized liquid crystal epoxy followed by doping BN fillers. Composites Part B 185:107784

    Article  CAS  Google Scholar 

  34. Islam AM, Lim H, You NH, Ahn S, Goh M, Hahn JR, Yeo H, Jang SG (2018) Enhanced thermal conductivity of liquid crystalline epoxy resin using controlled linear polymerization. ACS Macro Lett 7:1180–1185

    Article  CAS  PubMed  Google Scholar 

  35. Anithambigai P, Chakravarthii MKD, Mutharasu D, Huong LH, Zahner T, Lacey D, Kamarulazizi I (2017) Potential thermally conductive alumina filled epoxy composite for thermal management of high power LEDs. J Mater Sci Mater Electron 28:856–867

    Article  CAS  Google Scholar 

  36. Chen Y, Hou X, Liao M, Dai W, Wang Z, Yan C, Li H, Lin C, Jiang N, Yu J (2020) Constructing a “pea-pod-like” alumina-graphene binary architecture for enhancing thermal conductivity of epoxy composite. Chem Eng J 381:122690

    Article  CAS  Google Scholar 

  37. Chen X, Lim JSK, Yan W, Guo F, Liang YN, Chen H, Lambourne A, Hu X (2020) Salt template assisted BN scaffold fabrication toward highly thermally conductive epoxy composites. ACS Appl Mater Interfaces 12:16987–16996

    Article  CAS  PubMed  Google Scholar 

  38. Lin CH, Whang WT, Chen CH et al (2020) Novel siloxane-modified epoxy resins as promising encapsulant for LEDs. Polymers 12:21

    Article  Google Scholar 

  39. Yurrita N, Aizpurua J, Cambarau W, Huang S, Chen K (2021) Photovoltaic modules encapsulated in composite material modified with ultraviolet additives. Sol Energy Mater Sol Cells 230:111250

    Article  CAS  Google Scholar 

  40. Gan Y, Jiang X, Yin J (2014) Thiol-ene photo-curable hybrid silicone resin for LED encapsulation: enhancement of light extraction efficiency by facile self-keeping hemisphere coating. J Mater Chem C 2:5533–5539

    Article  CAS  Google Scholar 

  41. Kim JS, Yang SC, Kwak SY, Choi YW, Paik KW, Bae BS (2012) High performance encapsulant for light-emitting diodes (LEDs) by a sol-gel derived hydrogen siloxane hybrid. J Mater Chem 22:7954–7960

    Article  CAS  Google Scholar 

  42. He Q, Li A, Zhang Y, Liu S, Guo Y, Kong L (2018) A study on mechanical and tribological properties of silicone rubber reinforced with white carbon black. Tribol-Mater Surf Interfaces 12:9–16

    Article  CAS  Google Scholar 

  43. Li Y, Chen Z, Li X, Zeng H (2011) A new surface modification method to improve the dispersity of nano-silica in organic solvents. J Sol-Gel Sci Technol 58:290–295

    Article  CAS  Google Scholar 

  44. Di M, He S, Li R, Yang D (2006) Radiation effect of 150 keV protons on methyl silicone rubber reinforced with MQ silicone resin. Nucl Instr Meth Phys Res B 248:31–36

    Article  CAS  Google Scholar 

  45. Pradhan B, Srivastava SK (2014) Layered double hydroxide/multiwalled carbon nanotube hybrids as reinforcing filler in silicone rubber. Composites Part A 56:290–299

    Article  CAS  Google Scholar 

  46. Ma W, Li J, Deng B, Lin X, Zhao X (2013) Properties of functionalized graphene/room temperature vulcanized silicone rubber composites prepared by an in-situ reduction method. J Wuhan Univ Technol Mater Sci Ed 28:127–131

    Article  CAS  Google Scholar 

  47. Hu H, Ma J, Li X, Yin Q, Fan L, Wei X, Peng Q, Yang J (2019) Benzocyclobutene-functional double-decker silsesquioxane: self-assembled hybrid resin for high-performance dielectrics and LED encapsulants. Polym Chem 10:4551–4560

    Article  CAS  Google Scholar 

  48. Lee S, Hong JY, Jang J (2013) Multifunctional graphene sheets embedded in silicone encapsulant for superior performance of light-emitting diodes. ACS Nano 7:5784–5790

    Article  CAS  PubMed  Google Scholar 

  49. Zhang H, Lin Y, Zhang D, Wang W, Xing Y, Lin J, Hong H, Li C (2016) Graphene nanosheet/silicone composite with enhanced thermal conductivity and its application in heat dissipation of high-power light-emitting diodes. Curr Appl Phys 16:1695–1702

    Article  Google Scholar 

  50. Gao J, Bao F, Wu Q, Ma R, Han X, Jin D, Chen K, He J, Guo Z, Yan C (2016) Multifunctional graphene filled silicone encapsulant for high-performance light-emitting diodes. Mater Today Commun 7:149–154

    Article  CAS  Google Scholar 

  51. Gui D, Yu S, Xiong W, Cai X, Liu C, Liu J (2016) Liquid crystal functionalization of graphene nanoplatelets for improved thermal and mechanical properties of silicone resin composites. RSC Adv 6:35210–35215

    Article  CAS  Google Scholar 

  52. Zhao X, Zang C, Ma Q, Wen Y, Jiao Q (2016) Thermal and electrical properties of composites based on (3-mercaptopropyl) trimethoxysilane-and cu-coated carbon fiber and silicone rubber. J Mater Sci 51:4088–4095

    Article  CAS  Google Scholar 

  53. Yang D, Huang S, Ruan M, Li S, Yang J, Wu Y, Guo W, Zhang L (2018) Mussel inspired modification for aluminum oxide/silicone elastomer composites with largely improved thermal conductivity and low dielectric constant. Ind Eng Chem Res 57:3255–3262

    Article  CAS  Google Scholar 

  54. Xu S, Gao Q, Zhou C, Li J, Shen L, Lin H (2021) Improved thermal stability and heat-aging resistance of silicone rubber via incorporation of UiO-66-NH2. Mater Chem Phys 274:125182

    Article  CAS  Google Scholar 

  55. Wu S, Xiong Q, Li X, Chen D, Liu B (2021) Properties of thermally conductive silicone rubbers filled with admicellar polymerized polypyrrole-coated Al2O3 particles. J Appl Polym Sci 138:50205

    Article  CAS  Google Scholar 

  56. Pan Z, Zhu S, Huang B, Kang Y, Zhu L (2019) Synthesis of high-refractive-index epoxy-modified vinyl methyl phenyl silicone resins for encapsulation of LEDs. J Electron Mater 48:2865–2875

    Article  CAS  Google Scholar 

  57. Pan Z, Chen M, Zeng K, Kang Y (2022) Synthesis of epoxy-modified methyl phenyl silicone resins for LED encapsulation. Silicon 14:1159–1167

    Article  CAS  Google Scholar 

  58. Novak BM (1993) Hybrid nanocomposite materials-between inorganic glasses and organic polymers. Adv Mater 5:422–433

    Article  CAS  Google Scholar 

  59. Tao P, Li Y, Siegel RW, Schadler LS (2013) Transparent dispensible high-refractive index ZrO2/epoxy nanocomposites for LED encapsulation. J Appl Polym Sci 130:3785–3793

    Article  CAS  Google Scholar 

  60. Mont FW, Kim JK, Schubert MF, Schubert EF, Siegel RW (2008) High-refractive-index TiO2-nanoparticle-loaded encapsulants for light-emitting diodes. J Appl Phys 103:083120

    Article  Google Scholar 

  61. Ding KH, Wang GL, Zhang M (2012) Preparation and optical properties of transparent epoxy composites containing ZnO nanoparticles. J Appl Polym Sci 126:734–739

    Article  CAS  Google Scholar 

  62. Im H, Kim J (2012) Thermal conductivity of a graphene oxide-carbon nanotube hybrid/epoxy composite. Carbon 50:5429–5440

    Article  CAS  Google Scholar 

  63. Agrawal A, Satapathy A (2015) Epoxy composites filled with micro-sized AlN particles for microelectronic applications. Part Sci Technol 33:2–7

    Article  CAS  Google Scholar 

  64. Constantinescu DM, Apostol DA, Picu CR, Krawczyk K, Sieberer M (2017) Mechanical properties of epoxy nanocomposites reinforced with functionalized silica nanoparticles. Procedia Struct Integr 5:647–652

    Article  Google Scholar 

  65. Lai Y, Jin L, Hang J, Sun X, Shi L (2015) Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation. J Coat Technol Res 12:1185–1192

    Article  CAS  Google Scholar 

  66. Zhan X, Xing Q, Liu H, Zhang J, Cheng J, Lin X (2014) A facile method for fabrication of titanium-doped hybrid materials with high refractive index. RSC Adv 4:13909–13918

    Article  CAS  Google Scholar 

  67. Huang Y, Feng Y, Sun X, Han Y, Liu D, Tan X (2019) Preparation of ZrO2/silicone hybrid materials for LED encapsulation via in situ sol-gel reaction. Polym Adv Technol 30:1818–1824

    Article  CAS  Google Scholar 

  68. Kim YH, Bae JY, Jin J, Bae BS (2014) Sol-gel derived transparent zirconium-phenyl siloxane hybrid for robust high refractive index LED encapsulant. ACS Appl Mater Interfaces 6:3115–3121

    Article  CAS  PubMed  Google Scholar 

  69. Yang Y, Li YQ, Shi HQ, Li WN, Xiao HM, Zhu LP, Luo YS, Fu SY, Liu TX (2011) Fabrication and characterization of transparent ZnO-SiO2/silicone nanocomposites with tunable emission colors. Composites Part B 42:2105–2110

    Article  Google Scholar 

  70. Trung NN, Luu QP, Son BT, Sinh LH, Bae JY (2012) Preparation and characterization of silicone resin nanocomposite containing CdSe/ZnS quantum dots. Polym Compos 33:1785–1791

    Article  CAS  Google Scholar 

  71. Cheng Y, Lu C, Yang B (2011) A review on high refractive index nanocomposites for optical applications. Recent Pat Mater Sci 4:15–27

    Article  CAS  Google Scholar 

  72. James J, Unni AB, Taleb K, Chapel JP, Kalarikkal N, Varghese S, Vignaud G, Grohens Y (2019) Surface engineering of polystyrene-cerium oxide nanocomposite thin films for refractive index enhancement. Nano-Struct Nano-Objects 17:34–42

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, China

    Jingbo Shen & Yakai Feng

  2. Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300072, China

    Yakai Feng

  3. Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin), Weijin Road 92, Tianjin, 300072, China

    Yakai Feng

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  1. Jingbo Shen
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JS: writing and original draft preparation and review and editing of the manuscript, YF: reviewing of the manuscript and supervision.

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Correspondence to Yakai Feng.

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Shen, J., Feng, Y. Recent Advances in Encapsulation Materials for Light Emitting Diodes: a Review. Silicon 15, 2163–2172 (2023). https://doi.org/10.1007/s12633-022-02171-y

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