Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol. 10, No. 2, June 2022, pp. 348~355 ISSN: 2089-3272, DOI: 10.52549/ijeei.v10i2.3236  348 Journal homepage: http://section.iaesonline.com/index.php/IJEEI/index Application of CaTiO 3 :Pr 3+ phosphor for enhancing the hue standard of WLEDs with double-film distant phosphor structure Dieu An Nguyen Thi 1 , Phan Xuan Le 2 1 Faculty of Electrical Engineering Technology, Industrial University of Ho Chi Minh, Ho Chi Minh City, Viet Nam 2 Faculty of Mechanical - Electrical and Computer Engineering, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, Vietnam Article Info ABSTRACT Article history: Received Jul 23, 2021 Revised Sep 25, 2021 Accepted Nov 23, 2021 Due to its great thermal stability, the WLEDs (short for white-light diodes), which are made of PiG (short for phosphor-in-glass), appear to be an optical source most effective at generating potent white illumination. However, the actual applications they offer are limited by their poor hue generation as well as hue uniformity. To improve these features, this study suggested utilizing a configuration involving a PiG-RPL (short for PiG integrated with a lens of phosphor in red). The phosphor YAGG (also known as Y3Al3.08Ga1.92O12:Ce 3+ ) and borosilicate glass powders were printed, then sintered to generate the green PiG, and then using an inverted dispensing approach, we applied the CASN phosphor silicone in red color (also known as CaAlSiN3:Eu 2+ ) to the said PiG. As a result, with a current of 350 mA, the WLEDs made of PiG-RPL exhibit highly remarkable chromatic performance for the CRI (also known as color rendering index) values determined as Ra = 95.6 with R9 = 95.2 and fidelity/gamut values determined as Rf = 92 with Rg = 99.2. The color quality of the PiG-RPL based WLED device would be steady over a wide range of currents (100 - 1000 mA). Moreover, PiG-RPL based WLEDs have better color uniformity than typical PiG based WLEDs. Keyword: CaTiO 3 :Pr 3+ Color quality scale WLEDs Luminous flux Mie-scattering theory Copyright © 2022 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Phan Xuan Le Faculty of Mechanical - Electrical and Computer Engineering, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, Vietnam Email: le.px@vlu.edu.vn 1. INTRODUCTION The term SSL (short for solid-state lighting) applies to the diodes that generate light (LEDs) owing to their great luminous efficiency, extended lifetime, environmentally friendly, and power savings [1-3]. Currently, pc-WLEDs, which stands for white LEDs made of conversion phosphors, are the most popular LEDs, which are made from a phosphor resin of yellow color activated via a chip of blue color in the LED. But the said resin appears to be susceptible to thermal aging due to inferior heat conductance and poor heat resistance [4, 5]. Under long light excitation, the thermal aging of phosphor-resin accelerates, lowering the light output in WLEDs. The inorganic chroma transmuters possessing great thermal endurance, such as PiG, phosphor ceramic, and independent crystal, have been introduced for pc-WLEDs to tackle this problem [6-8]. Because of its incomplex preparation, customizable luminescence, reasonable cost, and mass manufacture, the PiG would be considered practical as well as effective as a chroma transmuter. Originally, sintering a combination that includes YAG phosphors and glass powders at low temperatures created a yellow Y 3 Al 5 O 12 :Ce 3+ (YAG) PiG, and then the composition are utilized to package WLEDs. Modifying the PiG’s indexes, such as the proportion of phosphor-glass as well as the phosphor layer’s thickness and arrangement, makes it simple to improve the light output in PiG-based WLEDs [9-11]. Unfortunately, when compared to natural light, the WLEDs made of YAG-phosphor PiG have low chromatic performance because of the