White Light-Emitting Diodes With High Color Rendering Index and Tunable Color Temperature Fabricated Using Separated Phosphor Layer Structure

White Light-Emitting Diodes With High Color Rendering Index and Tunable Color Temperature Fabricated Using Separated Phosphor Layer Structure

In this letter, phosphor-converted white light-emitting diodes (pc-WLEDs) were fabricated using two separated phosphor layers (B&G up/R down) that combine three color phosphors (blue, green, and red) with near-ultraviolet LED chips. The pc-WLEDs have a high color rendering index (CRI) and a tuna...

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Veröffentlicht in:IEEE electron device letters 2016-07, Vol.37 (7), p.898-901
Hauptverfasser: Chiang, Chung-Hao, Gong, Syuan-Jhih, Zhan, Ting-Shi, Cheng, Kuo-Ching, Chu, Sheng-Yuan
Format: Artikel
Sprache:eng
Schlagworte:
Coatings
Color
h color rendering index
Indexes
Light emitting diodes
Luminescence
Phosphors
Rendering (computer graphics)
tunable correlated color temperature
white light-emitting diodes
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container_end_page 901
container_issue 7
container_start_page 898
container_title IEEE electron device letters
container_volume 37
creator Chiang, Chung-Hao
Gong, Syuan-Jhih
Zhan, Ting-Shi
Cheng, Kuo-Ching
Chu, Sheng-Yuan
description In this letter, phosphor-converted white light-emitting diodes (pc-WLEDs) were fabricated using two separated phosphor layers (B&G up/R down) that combine three color phosphors (blue, green, and red) with near-ultraviolet LED chips. The pc-WLEDs have a high color rendering index (CRI) and a tunable color temperature. Regarding the spectra of the phosphors, the CRI value increased with the increasing percentage of overlapping area between the spectra deconvoluted from the electroluminescence spectrum of the pc-WLED. By controlling the thickness of the phosphor layers, the pc-WLEDs with high CRI values and various color temperatures can be obtained. The correlated color temperature and the CRI value of the optimized pc-WLED were 4606 K and 93.8, respectively.
doi_str_mv 10.1109/LED.2016.2576498
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subjects Coatings
Color
h color rendering index
Indexes
Light emitting diodes
Luminescence
Phosphors
Rendering (computer graphics)
tunable correlated color temperature
white light-emitting diodes
title White Light-Emitting Diodes With High Color Rendering Index and Tunable Color Temperature Fabricated Using Separated Phosphor Layer Structure
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