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s Vol No pp M Spectroscopy and Spectral Analysis April v x 5 f u S 9 v 0 S s K 1 LED r q 8 l p i O y V L C z e v 5 Y h v LED s v B LED 6 B LED v LED V LED P V 7 L C v LED v s LED LED x F L C x LED V n T r q A l o 7 4 T l y LED A T a 3 S A Ra y A R R I n 4 v LED 1 N 9 3 1 z v 5 LED n YAGG s Sr Ca AlSiN i d M E V Sr Ca AlSiN x i s Y V q y z LED q i s Y s x R x R Lighttools s Y y LED nm LED nm Sr Ca AlSiN YAGG x F L C LED T LED q s A LED Sr Ca AlSiN YAGG x F A s Y V Sr Ca AlSiN Eu YAGG x p LED LED Ra R R rLER lm W r A LED c 3 1 1 o M LED v e R R m s TN D S M A DOI j issn l 8 8 M LR F S E 9 YFB YFB S E 1 S 8 m 9 C T e o M 3 S 9 v 0 S 3 e mail qq com Y T e mail calla cjlu edu cn zhanghong cjlu edu cn 3 B d 3 V 1 T 3 K B V T 7 T V 4 o Y v i 7 i T nm V Y T nm V nm V y LED y r q 8 l p V v 5 A i O v 9 d i O LED X z v LED v V s B T v LED F 6 B LED x F s l s B LED F V F y 3 f 1 LED 3 3 s T V 3 3 K R B 6 B LED x LED y e 7 y Z T s CaAlSiN Eu i k LED 5 3 r T L C Y LED 5 LED e y Lin Y V RB RBW RB and White LED 3 s V b c Y T V V 4 RBW LED 3 3 N b A Q 7 o l s u l a 3 l z A i LED x M LED i 7 v T V red yellow blue 3 A v 3 z A L V y A R R V LED v 5 5 I n v LED R R p V Sr Ca AlSiN x Sr x s xYAGG 5 E q y E q s i s T LED A Y L s 1 1 LED E 5 L Z E y LED Q V LED x i d F x R x s s x s V x l L C LED x l x s LED u 1 2 Z E k p E LED Y V x s x 1 p InGaN InGaN b LED K Q Z ATA LED s d HAAS 9 K LED M 1 A r k 1 3 4 d M E Ca N Si N AlN EuN T S V Sr Ca AlSiN x XRD h n 5 F T m a FL s 9 Sr Ca AlSiN Eu x m nm Sr c 1 V 3 M nm m b Sr Ca AlSiN Eu m V Sr Sr Ca AlSiN Eu x em z FWHM V V Sr Ca AlSiN Eu x FWHM Sr c 9 F C 5 9 F h l t Sr Ca AlSiN Eu x nm z nm H Sr Ca AlSiN Eu x C K v O Y V Sr Sr Ca AlSiN Eu YAGG C H A K D Sr Ca AlSiN Eu x n s xYAGG s o nm FWHM nm T 2 1 T s 9 3 1 Sr Ca AlSiN Eu YAGG F Light m1 a Sr Ca 0 9 2 AlSiN3 0 0 8 Eu 2 x m b Sr0 8 Ca 0 1 2 AlSiN3 0 0 8 Eu 2 m Fig 1 a The emissio n spectrum o f Sr Ca 0 9 2 AlSiN3 0 0 8 Eu 2 Ex 4 5 0 nm b Fluo rescence spectrum o f Sr0 8 Ca 0 1 2 AlSiN3 0 0 8 Eu 2 s V1 Sr Sr Ca 0 9 2 AlSiN3 0 0 8 Eu 2 x Ta ble 1 Da ta o f spectra l cha ra cteristic pa ra meters o f Sr Ca 0 9 2 AlSiN3 0 0 8 Eu 2 pho spho rs with dif ferent Sr do ping a mo unts Sr z nm nm A7 浇 浇 A7 浇 浇 A7 浇 浇 A7 浇 浇 A7 浇 浇 A7 浇 浇 Tools q s Y q y x V 7 L C LED e m U m m s Y Duv H q e Y V e x s x 8 s E q s m V m V A M 1 T E V 3 T E A x s x 8 s 1 Z U V V V V A Sr c H Z R R 1 x LED s B 9 LED x e e u Y o LED T B o nm 6 B o nm V CCT x E y A R R 1 m2 e Fig 2 Spectra l reg ula tio n mo del V V V C 1 E A Sr Ca AlSiN Eu YAGG x F R R v 4 K H R R A R V r 4 3 s m3 H q x E q m Duv 0 0 0 5 4 Fig 3 Simula ted spectra l g ra phs under different CCTs ba sed o n o ne chip spectra l reg ula tio n mo del 2 2 T s CaAlSiN Eu YAGG x F WLED A s m a WLED A s m4 H q x E q m Duv 0 0 0 5 4 Fig 4 Simula ted spectra l g ra phs under different CCTs ba sed o n two chip spectra l reg ula tio n mo del V2 H q T E A Duv 0 0 0 5 4 Ta ble 2 Co lo r rendering index es o f simula ted spectra under different CCTs ba sed o n two chip spectra l reg ula tio n mo del Duv 0 0 0 5 4 K s x 8 s x 8 s Ra R R 靠 浇苘 乙 b 靠 浇苘 乙 b 靠 浇苘 乙 b 靠 浇苘 乙 b 靠 7 浇苘 乙 b 靠 7 浇苘 乙 b 靠 浇痧 浇苘 乙 b 靠 浇苘 乙 b V3 E y A R9 R1 2 1 Ta ble 3 Co mpa riso n o f R9 a nd R1 2 o f simula ted spectra K R nm R nm R nm R nm 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 枛 浇 浇 乙 浇 m5 WLED A 1 m a r 1 m b Fig 5 Co mpa riso n o f the a Ra R9 R1 2 a nd b LER 1 t m m b WLED rLER 1 t m CaAlSiN x s nm z nm YAGG s x nm z nm m V 4 s M WLED A Ra T WLED r 1 T V y T T LED T 9 v LED 9 v 7 r WLED y A R R T Sr Ca AlSiN Eu YAGG F T B LED m U k LED V m V A LED CCT K H V C z A Ra R R LER lm W CIE m6 LED LED m Fig 6 Spectrum pa cka g ed by using two blue LED chips m U S m U E B 8 C LED T LED V C s Y V M Q E V Sr Ca AlSiN x H Sr Ca AlSiN Eu 1 O r K v s Y y LED nm LED nm Sr Ca AlSiN Eu YAGG x e Sr Ca AlSiN Eu o nm z FWHM nm YAGG s x o nm z FWHM nm Y V M s x 8 s s Y T E K S LED i T y A R R s 1 T V x F R R T s Y CaAlSiN Eu YAGG x F 1 WLED M T A U R R A 4 B Sr Ca AlSiN Eu YAGG LED LED q CCT K Ra R R LER lm W E z v LED 9 4 B H 9 E q s B I N References Yun Y J Kim J K Ju J Y et al Phys Chem Chem Phys Song Z Xu Y Li C et al Ceramics International Chen J Y Zhang N M Guo C F et al ACS Applied Materials G China Illuminating Engineering Journal v DENG Jian kun CHEN Yan ke CHEN Zhi jie et al y S Chinese Journal of Luminescence Kuan Hung Lin Meng Yuan Huang Wen Dar Huang et al Scientia Horticulturae Han T Vaganov V Cao S et al Scientific Reports Zhu J Wang L Zhou T et al Journal of Materials Chemistry C s Pho spho r Co nv erted White Lig ht Emitting Dio des fo r Pla nt Lig hting CAO Li ZHENG Zi shan ZHANG Hong LIANG Pei ZHU Qiang qiang WANG Le College of Optics and Electronic Science and Technology China Jiliang University Hangzhou China Abstra ct LED has the advantages of high efficiency small size low power consumption long life and son on and it can easily achieve wide spectral regulation which makes it stand out in the field of agriculture Plant growth light emitting diodes LEDs can be divided into two categories one is monochromatic LED and the other is a White light emitting diode WLED WLEDs used for plant growth are either mixed with monochromatic LED or used alone to realize plant supplementary lighting Most of the WLEDs on plant growth is composed of a blue LED chip or a UV LED chip packed with phosphors that is phosphor converted WLEDs however the obtained spectra are concentrated in the bluish visible light and the efficiency of photosynthesis to plants is relatively poor The absorption spectra of the plant are not full band but selective based on the particularity of the absorption spectra of plant the color rendering performance of the spectra of WLEDs is regarded as the standard to judge whether the spectra are suitable for plant growth the average color rendering index Ra special color rendering index R saturated red light and R saturated blue light were considered as the main performance evaluation parameters of WLEDs on plant growth In order to design WLEDs with good performance and can be used in the field of agriculture common commercial YAGG was selected as green color conversion material and Sr Ca AlSiN was selected as red color conversion material Sr Ca AlSiN red phosphors were prepared by traditional high temperature solid state method and the spectral performance was analyzed By importing the built LED structure models into the simulation software LightTools and introducing the characteristic parameters of green phosphor particles red phosphor particles and blue chip respectively the simulation models of WLED were built based on a single blue LED chip nm and two blue LED chips nm separately the color rendering performance of the spectral power distribution of WLEDs under different correlated color temperature was studied under the two excitation modes In order to verify the difference of the color rendering index of the spectra obtained by the two excitation modes WLEDs were prepared by combining Sr Ca AlSiN and YAGG phosphors Eventually a real WLED was encapsulated by coating the combination of Sr Ca AlSiN Eu and YAGG phosphors on two blue chips and led to an optimal spectrum of Ra R R LER lm W which contains the blue and red light needed for plant growth Key wo rds WLED Plant lighting Spectral regulation R R Received Mar accepted Jul Corresponding authors s
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