A tirah chuan LED hi instrument leh meter-ah indicator light atan hman a ni. A hnuah chuan LED rawng hrang hrang chu traffic light leh area lian-a display-ah te hman a ni nasa hle a, hei hian sum leh pai leh khawtlang nunah hlawkna nasa tak a thlen a ni. Entirnan, United States-a traffic light sen inch 12-inch chuan a tir chuan a light source atan hun rei tak-life, low-efficiency 140-watt incandescent bulb a hmang a, chu chuan white light lumen 2000 a siam chhuak a ni. Filter sen a paltlang hnuah light 90% a bo a, red light lumen 200 chauh a awm ta a ni. A light design tharah chuan LED sen 18 a hmang a, circuit loss telin watt 14 chauh a hmang a, chu chuan luminous efficacy ang chiah chu a siam chhuak ta a ni.
Automotive signal light hi LED light source hmanna hmun pawimawh dang a ni bawk. Kum 1987 khan ka ram chuan lirtheiah brake light sang-mounted an dah tan a. LED-te fast response speed (nanosecond level) avang hian a hnuaia lirthei khalhtute chu lirthei khalh dan tur hriattir hmasak an ni thei a, hei hian hnunglam-end-a inhnawh tawnna a ti tlem a ni.
Chu bakah, LED light hi pawn lama red, green, leh blue full-color display, keychain-style mini flashlight, leh field dang dangah te hman a ni bawk.
White LEDs: General lighting atan chuan white light source hi duhthusam zawk a ni. White LED hi kum 1998 khan hlawhtling takin siam a ni a, heng LED te hi GaN chip leh yttrium aluminum garnet (YAG) te encapsulate hmanga siam a ni.
GaN chip hian êng dum (λp=465nm, Wd=30nm) a pe chhuak a. Ce3+-containing YAG phosphor, temperature sang taka sintered hian he blue light hian a excited chuan yellow light a pe chhuak a, a peak wavelength chu 550nm a ni. Blue LED substrate hi bowl-shaped reflective cavity-ah dah a ni a, YAG nena chawhpawlh resin layer te tak te, 200-500nm vel a thuk hmanga khuh a ni. LED substrate atanga blue light chhuak thenkhat chu phosphor hian a hip lut a, a bak blue light chu phosphor atanga yellow light chhuak nen a inhmeh a, white light a siam chhuak thin. InGaN/YAG white LEDs tan chuan YAG phosphor chemical composition thlak danglam leh phosphor layer thickness siamrem hian white light rawng hrang hrang, color temperature 3500-10000K inkar a hmu thei a ni.
Table 1-ah hian tuna LED dum chi hrang hrang awmte leh an light-emitting principle te tarlan a ni. Table-ah hian LED light source dum chi thenkhat chu phosphor pali-ah an innghat tih a lang bawk: primary color pathum-rare-earth red, green, leh blue phosphor-leh phosphor sen pakhat garnet structure nei. Wavelength LED pathum-, inorganic ultraviolet chip hmanga RGB phosphor hmanga LED dum encapsulate te hi sumdawnna atana hman theihna chance an neih beisei a ni. Mahse, heng primary color phosphor pathumte particle size leh stability mamawh hi a tlem hle a, an hmanna bik pawh hi chhui mek a la ni.
Tunah hian sumdawnna atana hman theih hmasa ber chu blue single-chip LED a ni a, YAG yellow phosphor a hmang a, luminous efficiency tha ber 25 lumens/watt vel a nei thei a ni. YAG hi Japan rama Nichia Corporation atanga lakluh a ni ber a, a man hi 2000 yuan/kg vel a ni. A chi hnihna chu Japan rama Sumitomo Electric Industries siam LED dum a ni a, ZnSe chu material atan hmangin, mahse luminous efficiency a hniam zawk thung.
