On application of heat-conductive plastics in LED technology
A comparative analysis of the characteristics of heat-conducting plastic was performed. The results of the thermal measurements of two of the same type 3W LED modules installed on heat sink with the same area of heat-dissipating surface made of aluminum and heat-conducting polymer have been pr...
Збережено в:
| Опубліковано в: : | Semiconductor Physics Quantum Electronics & Optoelectronics |
|---|---|
| Дата: | 2013 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України
2013
|
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/117692 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | On application of heat-conductive plastics in LED technology / Yu.V. Trofimov, S.I. Lishik, P.P. Pershukevich // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2013. — Т. 16, № 2. — С. 198-200. — Бібліогр.: 1 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-117692 |
|---|---|
| record_format |
dspace |
| spelling |
Trofimov, Yu.V. Lishik, S.I. Pershukevich, P.P. 2017-05-26T09:57:45Z 2017-05-26T09:57:45Z 2013 On application of heat-conductive plastics in LED technology / Yu.V. Trofimov, S.I. Lishik, P.P. Pershukevich // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2013. — Т. 16, № 2. — С. 198-200. — Бібліогр.: 1 назв. — англ. 1560-8034 PACS 44.10.+i, 85.60.Jb https://nasplib.isofts.kiev.ua/handle/123456789/117692 A comparative analysis of the characteristics of heat-conducting plastic was performed. The results of the thermal measurements of two of the same type 3W LED modules installed on heat sink with the same area of heat-dissipating surface made of aluminum and heat-conducting polymer have been presented. It has been shown that the overheating of LED module mounted on the heat-conducting polymer heat sink is 2…3 °С higher than that on the aluminum heat sink (thermal conductivity is 20 times higher). The ranges of applicability of the heat-conducting plastics in LED technology have been determined. en Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України Semiconductor Physics Quantum Electronics & Optoelectronics On application of heat-conductive plastics in LED technology Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
On application of heat-conductive plastics in LED technology |
| spellingShingle |
On application of heat-conductive plastics in LED technology Trofimov, Yu.V. Lishik, S.I. Pershukevich, P.P. |
| title_short |
On application of heat-conductive plastics in LED technology |
| title_full |
On application of heat-conductive plastics in LED technology |
| title_fullStr |
On application of heat-conductive plastics in LED technology |
| title_full_unstemmed |
On application of heat-conductive plastics in LED technology |
| title_sort |
on application of heat-conductive plastics in led technology |
| author |
Trofimov, Yu.V. Lishik, S.I. Pershukevich, P.P. |
| author_facet |
Trofimov, Yu.V. Lishik, S.I. Pershukevich, P.P. |
| publishDate |
2013 |
| language |
English |
| container_title |
Semiconductor Physics Quantum Electronics & Optoelectronics |
| publisher |
Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України |
| format |
Article |
| description |
A comparative analysis of the characteristics of heat-conducting plastic was
performed. The results of the thermal measurements of two of the same type 3W LED
modules installed on heat sink with the same area of heat-dissipating surface made of
aluminum and heat-conducting polymer have been presented. It has been shown that the
overheating of LED module mounted on the heat-conducting polymer heat sink is
2…3 °С higher than that on the aluminum heat sink (thermal conductivity is 20 times
higher). The ranges of applicability of the heat-conducting plastics in LED technology
have been determined.
|
| issn |
1560-8034 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/117692 |
| citation_txt |
On application of heat-conductive plastics in LED technology / Yu.V. Trofimov, S.I. Lishik, P.P. Pershukevich // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2013. — Т. 16, № 2. — С. 198-200. — Бібліогр.: 1 назв. — англ. |
| work_keys_str_mv |
AT trofimovyuv onapplicationofheatconductiveplasticsinledtechnology AT lishiksi onapplicationofheatconductiveplasticsinledtechnology AT pershukevichpp onapplicationofheatconductiveplasticsinledtechnology |
| first_indexed |
2025-11-26T23:38:05Z |
| last_indexed |
2025-11-26T23:38:05Z |
| _version_ |
1850781632045252608 |
| fulltext |
Semiconductor Physics, Quantum Electronics & Optoelectronics, 2013. V. 16, N 2. P. 198-200.
© 2013, V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
198
PACS 44.10.+i, 85.60.Jb
On application of heat-conductive plastics in LED technology
Yu.V. Trofimov, S.I. Lishik, P.P. Pershukevich
SE Center of LED and Optoelectronic Technologies of National Academy of Sciences of Belarus,
Logoisky trakt 22, 220090 Minsk, Belarus
Phone: +375-17-281-13-35, fax: +375-17-283-91-51; www.ledcenter.by
Abstract. A comparative analysis of the characteristics of heat-conducting plastic was
performed. The results of the thermal measurements of two of the same type 3W LED
modules installed on heat sink with the same area of heat-dissipating surface made of
aluminum and heat-conducting polymer have been presented. It has been shown that the
overheating of LED module mounted on the heat-conducting polymer heat sink is
2…3 С higher than that on the aluminum heat sink (thermal conductivity is 20 times
higher). The ranges of applicability of the heat-conducting plastics in LED technology
have been determined.
Keywords: LED, composite heat sink, thermal conductive plastics.
Manuscript received 10.12.12; revised version received 23.01.13; accepted for
publication 19.03.13; published online 25.06.13.
1. Introduction
Typically, heat removal and dissipation in LED
technology is reached with metal (aluminium)
thermal heat sinks manufactured by molding or
extrusion. In recent years, however, the market has
seen new entrants – heat-conductive plastic. Heat-
conducting plastic is a polymer composite material,
in which for increased conductivity, it is fitted with
high heat conductivity filler. The characteristics of
some commercially available heat-conducting
plastics are shown in Table. The advantages of heat-
conducting plastics include: low density, a high
stiffness to weight and strength to weight ratios,
manufacturability and precise molding under
pressure, etc. However, applicability of material of
this type in LED technology is still insufficiently
investigated.
Thus, the aim of this work is to study applicability
of heat-conducting plastics as heat sinks for LED
technology.
2. Method
The methodology for this paper is based on a comparison
of thermal images of experimental samples of LED
devices that are completely identical to each other except
for the materials used and shape of the heat sinks.
Fig. 1 shows the external view of the experimental
equipment. 3W LED aluminum printed circuit boards
with a diameter of 50 mm were used in it. The printed
circuit board is attached to the heat sink with screws and
thermal KPT-8 paste.
In the first case, the heat sink is a piece of ribbed
(plate) aluminum. In the second case, the heat sink is a
needle filled fragment from heat-conducting plastic [1],
provided by LLC “Spetsplast-M” (Russia). Despite the
differences in geometry, thermal heat sinks had the same
heat-dissipating surface area S = 0.013 m2.
Thermal measurements were carried out using the
thermal imager FLIR A325 (Sweden). Thermal
modeling of cooling heat sinks is done using CAD
software SolidWorks.
Semiconductor Physics, Quantum Electronics & Optoelectronics, 2013. V. 16, N 2. P. 198-200.
© 2013, V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
199
Table. Thermal conductivity of several heat-conducting
plastics.
Trading Brand Manufacturer
Thermal
conductivity,
W/(m·K)
COOLPOLY
Cool Polymers,
USA
1.0–40.0
LATICONTER
Lati Industria
Termoplastici,
Italy
1.0–15.0
FORTRON Ticona, Germany 1.1–3.0
RTP (99x)
RTP, Imagineering
Plastics, USA
1.0–18.0
TEPLOSTOK
“SPETSPLAST-
M”, Russia
1.0–13.0
Fig. 1. Experimental samples with heat sinks made of
aluminum (left) and composite (right).
3. Results
Fig. 2 shows the thermal images of two heat sinks, one
of which is made of aluminum alloy, and the second of
the heat-conducting plastic. It should be noted that the
heat-conducting plastic heat sink design enable to
observe more uneven temperature distribution than that
in the heat sink based on aluminum alloy.
The analysis of Fig. 2 shows that the overheating of
LED circuit board mounted on the heat sink of heat-
conducting polymer is approximately T = 3 C higher
than that in the case of the analogous aluminum heat
sink, despite the fact that the thermal conductivity of the
heat-conducting plastic is 20 times lower.
Obviously, T = T1 + T2, where T1 – the
contribution due to different geometrical shape of the
heat sink (needle/ribbed), T2 – the contribution due to
the heat sink materials of a different thermal
conductivity. According to the results of thermal
modeling (Fig. 3), the temperature for the needle (pin)
design heat sink is 2.1 C lower than the ridge (plate)
design heat sink, i.e. T1 = –2.1 C. Thus, T2 =
= T – T1 = 3 C + 2.1 C = 5.1 C, i.e. the temperature
of heat sinks of the same shape, but made from a
thermally conductive plastic and aluminum would differ
by approximately 5 C.
It should be noted that this result is valid only to a
low-power LED devices. As the power of LED
increases, T2 increases proportionately. So, in the case
of 10W lamp for HCS the temperature difference
increases to T2 = 19 C (Fig. 4).
Fig. 2. Experimental temperature distribution (running time is
60 min).
a
b
Fig. 3. Comparison of cooling efficiency ridge (a) and the
needle (b) aluminum heat sinks that have the same surface area
S = 0.013 m2.
Semiconductor Physics, Quantum Electronics & Optoelectronics, 2013. V. 16, N 2. P. 198-200.
© 2013, V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
200
a
b
Fig. 4. Model of the temperature distribution on the lamp for
housing, made of aluminum alloy (a) and thermally conductive
polymer (b).
4. Conclusions
1. Thermal conductivity λ of the material is 10 W/(m∙K),
which is not always enough to transfer all the heat to the
cooled surface to be released out of the system.
2. The disadvantage of heat-conductive composites
is in the significantly increased resistance to heat flow
compared to aluminum, which does not allow using it
for heat removal from point sources. Therefore, the
possibility of application of a thermally conductive
composite material must be checked carefully in each
case.
3. The advantages of heat-conductive composites
include the possibility to manufacture heat sinks of
almost any shape. Also, the transition from the ribbed to
the needle design increases the cooling efficiency of the
heat sink by 11%.
References
1. A.M. Krivatkin, Y.I. Sakunenko, Dissipating
plastics – call to aluminum // Solid-state Lighting
Eng. 1, p. 54-56 (2010).
Semiconductor Physics, Quantum Electronics & Optoelectronics, 2013. V. 16, N 2. P. 198-200.
PACS 44.10.+i, 85.60.Jb
On application of heat-conductive plastics in LED technology
Yu.V. Trofimov, S.I. Lishik, P.P. Pershukevich
SE Center of LED and Optoelectronic Technologies of National Academy of Sciences of Belarus,
Logoisky trakt 22, 220090 Minsk, Belarus
Phone: +375-17-281-13-35, fax: +375-17-283-91-51; www.ledcenter.by
Abstract. A comparative analysis of the characteristics of heat-conducting plastic was performed. The results of the thermal measurements of two of the same type 3W LED modules installed on heat sink with the same area of heat-dissipating surface made of aluminum and heat-conducting polymer have been presented. It has been shown that the overheating of LED module mounted on the heat-conducting polymer heat sink is 2…3 (С higher than that on the aluminum heat sink (thermal conductivity is 20 times higher). The ranges of applicability of the heat-conducting plastics in LED technology have been determined.
Keywords: LED, composite heat sink, thermal conductive plastics.
Manuscript received 10.12.12; revised version received 23.01.13; accepted for publication 19.03.13; published online 25.06.13.
1. Introduction
Typically, heat removal and dissipation in LED technology is reached with metal (aluminium) thermal heat sinks manufactured by molding or extrusion. In recent years, however, the market has seen new entrants – heat-conductive plastic. Heat-conducting plastic is a polymer composite material, in which for increased conductivity, it is fitted with high heat conductivity filler. The characteristics of some commercially available heat-conducting plastics are shown in Table. The advantages of heat-conducting plastics include: low density, a high stiffness to weight and strength to weight ratios, manufacturability and precise molding under pressure, etc. However, applicability of material of this type in LED technology is still insufficiently investigated.
Thus, the aim of this work is to study applicability of heat-conducting plastics as heat sinks for LED technology.
2. Method
The methodology for this paper is based on a comparison of thermal images of experimental samples of LED devices that are completely identical to each other except for the materials used and shape of the heat sinks.
Fig. 1 shows the external view of the experimental equipment. 3W LED aluminum printed circuit boards with a diameter of 50 mm were used in it. The printed circuit board is attached to the heat sink with screws and thermal KPT-8 paste.
In the first case, the heat sink is a piece of ribbed (plate) aluminum. In the second case, the heat sink is a needle filled fragment from heat-conducting plastic [1], provided by LLC “Spetsplast-M” (Russia). Despite the differences in geometry, thermal heat sinks had the same heat-dissipating surface area S = 0.013 m2.
Thermal measurements were carried out using the thermal imager FLIR A325 (Sweden). Thermal modeling of cooling heat sinks is done using CAD software SolidWorks.
Table. Thermal conductivity of several heat-conducting plastics.
Trading Brand
Manufacturer
Thermal conductivity, W/(m·K)
COOLPOLY
Cool Polymers, USA
1.0–40.0
LATICONTER
Lati Industria Termoplastici, Italy
1.0–15.0
FORTRON
Ticona, Germany
1.1–3.0
RTP (99x)
RTP, Imagineering Plastics, USA
1.0–18.0
TEPLOSTOK
“SPETSPLAST-M”, Russia
1.0–13.0
Fig. 1. Experimental samples with heat sinks made of aluminum (left) and composite (right).
3. Results
Fig. 2 shows the thermal images of two heat sinks, one of which is made of aluminum alloy, and the second of the heat-conducting plastic. It should be noted that the heat-conducting plastic heat sink design enable to observe more uneven temperature distribution than that in the heat sink based on aluminum alloy.
The analysis of Fig. 2 shows that the overheating of LED circuit board mounted on the heat sink of heat-conducting polymer is approximately (T = 3 (C higher than that in the case of the analogous aluminum heat sink, despite the fact that the thermal conductivity of the heat-conducting plastic is 20 times lower.
Obviously, (T = (T1 + (T2, where (T1 – the contribution due to different geometrical shape of the heat sink (needle/ribbed), (T2 – the contribution due to the heat sink materials of a different thermal conductivity. According to the results of thermal modeling (Fig. 3), the temperature for the needle (pin) design heat sink is 2.1 (C lower than the ridge (plate) design heat sink, i.e. (T1 = –2.1 (C. Thus, (T2 =
= (T – (T1 = 3 (C + 2.1 (C = 5.1 (C, i.e. the temperature of heat sinks of the same shape, but made from a thermally conductive plastic and aluminum would differ by approximately 5 (C.
It should be noted that this result is valid only to a low-power LED devices. As the power of LED increases, (T2 increases proportionately. So, in the case of 10W lamp for HCS the temperature difference increases to (T2 = 19 (C (Fig. 4).
Fig. 2. Experimental temperature distribution (running time is 60 min).
a
b
Fig. 3. Comparison of cooling efficiency ridge (a) and the needle (b) aluminum heat sinks that have the same surface area S = 0.013 m2.
a
b
Fig. 4. Model of the temperature distribution on the lamp for housing, made of aluminum alloy (a) and thermally conductive polymer (b).
4. Conclusions
1. Thermal conductivity λ of the material is 10 W/(m∙K), which is not always enough to transfer all the heat to the cooled surface to be released out of the system.
2. The disadvantage of heat-conductive composites is in the significantly increased resistance to heat flow compared to aluminum, which does not allow using it for heat removal from point sources. Therefore, the possibility of application of a thermally conductive composite material must be checked carefully in each case.
3. The advantages of heat-conductive composites include the possibility to manufacture heat sinks of almost any shape. Also, the transition from the ribbed to the needle design increases the cooling efficiency of the heat sink by 11%.
References
1. A.M. Krivatkin, Y.I. Sakunenko, Dissipating plastics – call to aluminum // Solid-state Lighting Eng. 1, p. 54-56 (2010).
© 2013, V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine
198
|