The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs
When phosphor converted white light emitting diodes were operated under stepwise current modulation (SCM) and pulse width modulation (PWM), the change in chromaticity and spectrum were investigated. In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while b...
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| creator | Seungtaek Kim Kyeongyong Cho Hyungtae Kim Jongseok Kim Youngjune Cho |
| description | When phosphor converted white light emitting diodes were operated under stepwise current modulation (SCM) and pulse width modulation (PWM), the change in chromaticity and spectrum were investigated. In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while blue shift with increasing duty ratio in PWM In SCM, the peak wavelength around blue color band moved to shorter wavelengths and the efficiency of blue-to-yellow conversion also increased as forward current increased. Meanwhile, a peak wavelength in PWM was almost fixed but the light conversion efficiency decreased as duty ratio increased. The average Δuv was 0.004193 in SCM and 0.003210 in PWM. |
| doi_str_mv | 10.1109/ISOT.2012.6403266 |
| format | Conference Proceeding |
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In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while blue shift with increasing duty ratio in PWM In SCM, the peak wavelength around blue color band moved to shorter wavelengths and the efficiency of blue-to-yellow conversion also increased as forward current increased. Meanwhile, a peak wavelength in PWM was almost fixed but the light conversion efficiency decreased as duty ratio increased. The average Δuv was 0.004193 in SCM and 0.003210 in PWM.</description><identifier>ISBN: 1467328758</identifier><identifier>ISBN: 9781467328753</identifier><identifier>EISBN: 1467328774</identifier><identifier>EISBN: 9781467328760</identifier><identifier>EISBN: 9781467328777</identifier><identifier>EISBN: 1467328766</identifier><identifier>DOI: 10.1109/ISOT.2012.6403266</identifier><language>eng</language><publisher>IEEE</publisher><subject>Chromaticity ; Color diference ; Constant current modulation ; PC white LED ; Pulse width modulation ; Spectrum</subject><ispartof>2012 International Symposium on Optomechatronic Technologies (ISOT 2012), 2012, p.1-6</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/6403266$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,776,780,785,786,2052,27902,54895</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/6403266$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Seungtaek Kim</creatorcontrib><creatorcontrib>Kyeongyong Cho</creatorcontrib><creatorcontrib>Hyungtae Kim</creatorcontrib><creatorcontrib>Jongseok Kim</creatorcontrib><creatorcontrib>Youngjune Cho</creatorcontrib><title>The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs</title><title>2012 International Symposium on Optomechatronic Technologies (ISOT 2012)</title><addtitle>ISOT</addtitle><description>When phosphor converted white light emitting diodes were operated under stepwise current modulation (SCM) and pulse width modulation (PWM), the change in chromaticity and spectrum were investigated. In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while blue shift with increasing duty ratio in PWM In SCM, the peak wavelength around blue color band moved to shorter wavelengths and the efficiency of blue-to-yellow conversion also increased as forward current increased. Meanwhile, a peak wavelength in PWM was almost fixed but the light conversion efficiency decreased as duty ratio increased. The average Δuv was 0.004193 in SCM and 0.003210 in PWM.</description><subject>Chromaticity</subject><subject>Color diference</subject><subject>Constant current modulation</subject><subject>PC white LED</subject><subject>Pulse width modulation</subject><subject>Spectrum</subject><isbn>1467328758</isbn><isbn>9781467328753</isbn><isbn>1467328774</isbn><isbn>9781467328760</isbn><isbn>9781467328777</isbn><isbn>1467328766</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>2012</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><sourceid>RIE</sourceid><recordid>eNpFkEtLw0AAhFdEUGt_gHjZP5C478dRYtVCSgONeCzrPsiKaUp2RfrvTbXgaZgZvjkMALcYlRgjfb_crNuSIExKwRAlQpyBa8yEpERJyc7_DVeXYJ7SB0JoAgXD-Ao0beehD8HbnOAQ4KZaQbNzsHlbwWEH89Tabhx6k6ON-fDbHcO0n4jxqz8yTQW_u5g9rBeP6QZcBPOZ_PykM_D6tGirl6JePy-rh7qIWPJcEKmZE--OYO5UUCRwrgThIiAiEObMKOkso1YHLh2i1BqmdUBWGqWMForOwN3fbvTeb_dj7M142J4eoD_-NEyZ</recordid><startdate>201210</startdate><enddate>201210</enddate><creator>Seungtaek Kim</creator><creator>Kyeongyong Cho</creator><creator>Hyungtae Kim</creator><creator>Jongseok Kim</creator><creator>Youngjune Cho</creator><general>IEEE</general><scope>6IE</scope><scope>6IL</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIL</scope></search><sort><creationdate>201210</creationdate><title>The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs</title><author>Seungtaek Kim ; Kyeongyong Cho ; Hyungtae Kim ; Jongseok Kim ; Youngjune Cho</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i175t-2794d6bd215d8f82f5586256f0260154a87dc43c9f57d033ca499f0c7a88a9683</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Chromaticity</topic><topic>Color diference</topic><topic>Constant current modulation</topic><topic>PC white LED</topic><topic>Pulse width modulation</topic><topic>Spectrum</topic><toplevel>online_resources</toplevel><creatorcontrib>Seungtaek Kim</creatorcontrib><creatorcontrib>Kyeongyong Cho</creatorcontrib><creatorcontrib>Hyungtae Kim</creatorcontrib><creatorcontrib>Jongseok Kim</creatorcontrib><creatorcontrib>Youngjune Cho</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan All Online (POP All Online) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library (IEL)</collection><collection>IEEE Proceedings Order Plans (POP All) 1998-Present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Seungtaek Kim</au><au>Kyeongyong Cho</au><au>Hyungtae Kim</au><au>Jongseok Kim</au><au>Youngjune Cho</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs</atitle><btitle>2012 International Symposium on Optomechatronic Technologies (ISOT 2012)</btitle><stitle>ISOT</stitle><date>2012-10</date><risdate>2012</risdate><spage>1</spage><epage>6</epage><pages>1-6</pages><isbn>1467328758</isbn><isbn>9781467328753</isbn><eisbn>1467328774</eisbn><eisbn>9781467328760</eisbn><eisbn>9781467328777</eisbn><eisbn>1467328766</eisbn><abstract>When phosphor converted white light emitting diodes were operated under stepwise current modulation (SCM) and pulse width modulation (PWM), the change in chromaticity and spectrum were investigated. In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while blue shift with increasing duty ratio in PWM In SCM, the peak wavelength around blue color band moved to shorter wavelengths and the efficiency of blue-to-yellow conversion also increased as forward current increased. Meanwhile, a peak wavelength in PWM was almost fixed but the light conversion efficiency decreased as duty ratio increased. The average Δuv was 0.004193 in SCM and 0.003210 in PWM.</abstract><pub>IEEE</pub><doi>10.1109/ISOT.2012.6403266</doi><tpages>6</tpages></addata></record> |
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| source | IEEE Electronic Library (IEL) Conference Proceedings |
| subjects | Chromaticity Color diference Constant current modulation PC white LED Pulse width modulation Spectrum |
| title | The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs |
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