TY - JOUR
T1 - White light emitting diodes with a high colour rendering index of 98.3 using blue emissive carbon dots
AU - Zhou, Lu
AU - Wang, Huiyong
AU - Yu, Hongmei
AU - Amador, Eric
AU - Xue, Jiajia
AU - Wang, Shaoyan
AU - Chen, Wei
N1 - Publisher Copyright:
© 2023 The Royal Society of Chemistry.
PY - 2023/10/26
Y1 - 2023/10/26
N2 - Fluorescent carbon dots (CDs) have become important materials for white light emitting diodes (WLEDs) due to their high stability, low cost and environmentally friendly nature. Here, blue carbon dots (B-CDs) were successfully prepared by a one-step hydrothermal method using theophylline and NaOH as raw materials. B-CDs were compounded with polyacrylamide (PAM), starch and chitosan (CTS) to make bright B-CD-based phosphors, respectively. Three different matrixes of B-CD-based phosphors were used to prepare WLEDs under UV chip excitation. The results show that the WLED prepared with the B-CDs/PAM phosphor exhibits the best performance. Compared to B-CDs, the fluorescence emission of the B-CDs/PAM phosphor is significantly enhanced and the quantum yield increases from 5.06% to 78.50% due to the inhibition of the non-radiative leap process by the matrix. The prepared WLED exhibits white light with colour coordinates of (0.3338, 0.3466), a correlated colour temperature (CCT) of 5442 K and a colour rendering index (CRI) of 98.3. Such a high CRI fully reflects the true colour of the object and has great potential for indoor lighting devices to protect the human eye and relieve eye strain.
AB - Fluorescent carbon dots (CDs) have become important materials for white light emitting diodes (WLEDs) due to their high stability, low cost and environmentally friendly nature. Here, blue carbon dots (B-CDs) were successfully prepared by a one-step hydrothermal method using theophylline and NaOH as raw materials. B-CDs were compounded with polyacrylamide (PAM), starch and chitosan (CTS) to make bright B-CD-based phosphors, respectively. Three different matrixes of B-CD-based phosphors were used to prepare WLEDs under UV chip excitation. The results show that the WLED prepared with the B-CDs/PAM phosphor exhibits the best performance. Compared to B-CDs, the fluorescence emission of the B-CDs/PAM phosphor is significantly enhanced and the quantum yield increases from 5.06% to 78.50% due to the inhibition of the non-radiative leap process by the matrix. The prepared WLED exhibits white light with colour coordinates of (0.3338, 0.3466), a correlated colour temperature (CCT) of 5442 K and a colour rendering index (CRI) of 98.3. Such a high CRI fully reflects the true colour of the object and has great potential for indoor lighting devices to protect the human eye and relieve eye strain.
UR - http://www.scopus.com/inward/record.url?scp=85176764800&partnerID=8YFLogxK
U2 - 10.1039/d3tc02297h
DO - 10.1039/d3tc02297h
M3 - Article
AN - SCOPUS:85176764800
SN - 2050-7534
VL - 11
SP - 15926
EP - 15933
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 45
ER -