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Triple-layer remote phosphor: An improved structure with higher color quality and luminous flux of white LEDs
- Source :
- THE 1ST INTERNATIONAL CONFERENCE ON INNOVATIONS FOR COMPUTING, ENGINEERING AND MATERIALS, 2021: ICEM, 2021.
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- This research suggests using triple-layer remote phosphor (TRP) to improve the color quality and luminous flux coming out of white LEDs (WLEDs). The TRP structure contains three different phosphor layers: beneath is the yellow phosphor YAG:Ce3+, a red phosphor LiInO2:Eu3+ above, and a green phosphor Zn2GeO4:Mn2+ in within. Controlling the red-light composition with a red phosphor layer LiInO2:Eu3+ leads to a higher color rendering index (CRI). Thus, increase the luminous efficacy (LE) of WLEDs using a green phosphor layer of CaLaB3O7:Ce3+,Mn2+ to monitor green light composition. Additionally, when increasing these two phosphor concentrations, the yellow concentration YAG:Ce3+ decreases to keep the average correlated color temperatures (ACCTs) within 6000K - 8500K. Besides CRI and LE, controlling green and red phosphor concentration is also a way to analyze the color quality scale (CQS). The study result shows that the higher the LiInO2:Eu3+ concentration, the greater the CRI value. However, CRI significantly reduces when increasing Zn2GeO4:Mn2+ concentration. Meanwhile, CQS can raise a substantial amount in the concentration range of 10%-14% LiInO2:Eu3+, flout LiInO2:Eu3+ concentration. Peculiarly, parallel with the improvement of CRI and CQS, LE also grows over 40% due to a decrease in backscattering light and added green light. This research may be valuable for manufactures for improving the color quality and luminous flux of WLEDs.
Details
- ISSN :
- 0094243X
- Database :
- OpenAIRE
- Journal :
- THE 1ST INTERNATIONAL CONFERENCE ON INNOVATIONS FOR COMPUTING, ENGINEERING AND MATERIALS, 2021: ICEM, 2021
- Accession number :
- edsair.doi...........ba537112042311abc6aea85cb6770daa