Near UV-pumped yellow-emitting Sr8MgSc(PO4)7:Eu2+ phosphor for white-light LEDs with excellent color rendering index

2011 ◽  
Vol 21 (15) ◽  
pp. 5645 ◽  
Author(s):  
Chien-Hao Huang ◽  
Yen-Chi Chen ◽  
Teng-Ming Chen ◽  
Ting-Shan Chan ◽  
Hwo-Shuenn Sheu
Keyword(s):  
White Light ◽  
Color Rendering Index ◽  
Color Rendering ◽  
Excellent Color

scholarly journals Excellent color rendering index single system white light emitting carbon dots for next generation lighting devices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Manasa Perikala ◽  
Asha Bhardwaj
Keyword(s):  
White Light ◽  
Carbon Dots ◽  
Quantum Yields ◽  
Single System ◽  
Light Emitting ◽  
Color Rendering Index ◽  
Different Color ◽  
Color Rendering ◽  
Excellent Color ◽  
Emission Bandwidth

AbstractRecently, quantum dots (QDs) are finding enormous application in white light emitting diodes (WLEDs) and WLEDs with high color rendition are in high demand. QD-WLEDs use different color (Red, Blue, Green) emitting QDs to obtain white light. Use of different color emitting QDs affect purity of white light due to self-absorption losses and QD degradation, in the long run affecting color rendering index (CRI) of WLEDs. Herein, we report low cost, environment friendly, open air atmosphere synthesis of single system white light emitting carbon dots (CDs) with broad emission bandwidth ranging 116 –143 nm and quantum yields (QY) ~ 5 – 13 % in colloidal state by modifying CD surface. Furthermore, carbon dot polymer phosphor (CD-PDMS phosphor) is fabricated which emits white light under UV illumination with a record emission bandwidth of ~ 154 nm and QY ~ 16 % in solid state. Moreover, CD-PDMS phosphor exhibit excellent color rendering index (CRI) ~ 96, the highest reported so far with CIE co-ordinates (0.31, 0.33) that are quite akin to pure white light. Such high performances are achieved due to high quality of CDs and CD-PDMS polymer phosphors by precise control in passivation/functionalization of nanoparticle surface. This work will set platform for the application of CD-phosphor based WLEDs in lighting systems.

Combination of carbon dot and polymer dot phosphors for white light-emitting diodes

Nanoscale ◽  
2015 ◽  
Vol 7 (28) ◽  
pp. 12045-12050 ◽  
Author(s):  
Chun Sun ◽  
Yu Zhang ◽  
Kai Sun ◽  
Claas Reckmeier ◽  
Tieqiang Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Light Emitting Diodes ◽  
Color Stability ◽  
Light Emitting ◽  
Color Rendering Index ◽  
Carbon Based Nanomaterials ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Excellent Color

The white light-emitting diodes with high color rendering index (85–96) and widely variable color temperatures(2805–7786 K) were fabricated from carbon-based nanomaterials with weak reabsorption and no energy transfer crosstalk and showed excellent color stability.

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