Suresh K, Poornachandra Rao Nannapaneni V, Murthy K V R
Department of Physics, CSR Sarma College, Ongole-523 001, A.P., India.
Department of Physics, Rajiv Gandhi University of Knowledge Technologies, IIIT, Basara-504101, AP, India.
Luminescence. 2016 Feb;31(1):179-82. doi: 10.1002/bio.2942. Epub 2015 May 29.
CaS:Ce(3+) is an efficient green-emitting (535 nm) phosphor, excitable with blue light (450-470 nm) and was synthesized via a solid-state reaction method by heating under a reducing atmosphere. The luminescent properties, photoluminescent (PL) excitation and emission of the phosphor were analyzed by spectrofluorophotometry. The excitation and emission peaks of the CaS:Ce(3+) phosphor lay in the visible region, which made them relevant for light-emitting diode (LED) application for the generation of white light. Judd-Oflet parameters were calculated and revealed that green light emitted upon blue illumination. The prepared phosphor had strong blue absorption at 470 nm and a broad green emission band range from 490-590 nm with the peak at 537 nm. The characteristics of the CaS:Ce(3+) phosphor make it suitable for use as a wavelength tunable green emitting phosphor for three band white LEDs pumped by a blue LED (470 nm). The Commission International de l'Eclairage co-ordinates were calculated by a spectrophotometric method using the spectral energy distribution (0.304, 0.526) and confirm the green emission. The potential application of this phosphor is as a phosphor-converted white light-emitting diode.
CaS:Ce(3+)是一种高效的绿色发光（535纳米）荧光粉，可被蓝光（450 - 470纳米）激发，通过在还原气氛下加热的固态反应法合成。通过荧光分光光度法分析了该荧光粉的发光特性、光致发光（PL）激发和发射情况。CaS:Ce(3+)荧光粉的激发峰和发射峰位于可见光区域，这使其与用于产生白光的发光二极管（LED）应用相关。计算了贾德 - 奥费特参数，结果表明在蓝光照射下发出绿光。制备的荧光粉在470纳米处有强烈的蓝光吸收，在490 - 590纳米范围内有一个宽的绿色发射带，峰值在537纳米。CaS:Ce(3+)荧光粉的特性使其适用于作为由蓝色LED（470纳米）泵浦的三波段白光LED的波长可调绿色发光荧光粉。通过使用光谱能量分布（0.304, 0.526）的分光光度法计算了国际照明委员会坐标，并证实了绿色发射。这种荧光粉的潜在应用是作为磷光体转换白光发光二极管。
