Wide bandgap light emitting materials and devices:
Gespeichert in:
| Format: | Buch |
|---|---|
| Sprache: | English |
| Veröffentlicht: |
Weinheim
Wiley-VCH-Verl.
2007
|
| Schlagworte: | |
| Online-Zugang: | Inhaltstext Inhaltsverzeichnis |
| Beschreibung: | Literaturangaben |
| Beschreibung: | XI, 214 S. Ill., graph. Darst. |
| ISBN: | 9783527403318 3527403310 |
Internformat
MARC
| LEADER | 00000nam a2200000 c 4500 | ||
|---|---|---|---|
| 001 | BV023011772 | ||
| 003 | DE-604 | ||
| 005 | 20080205 | ||
| 007 | t | ||
| 008 | 071120s2007 gw ad|| |||| 00||| eng d | ||
| 015 | |a 07,N08,1079 |2 dnb | ||
| 015 | |a 07,A43,0678 |2 dnb | ||
| 016 | 7 | |a 982799489 |2 DE-101 | |
| 020 | |a 9783527403318 |c Pp. : EUR 119.00 (freier Pr.), sfr 188.00 (freier Pr.) |9 978-3-527-40331-8 | ||
| 020 | |a 3527403310 |c Pp. : EUR 119.00 (freier Pr.), sfr 188.00 (freier Pr.) |9 3-527-40331-0 | ||
| 024 | 3 | |a 9783527403318 | |
| 028 | 5 | 2 | |a 1140331 000 |
| 035 | |a (OCoLC)170019419 | ||
| 035 | |a (DE-599)DNB982799489 | ||
| 040 | |a DE-604 |b ger |e rakddb | ||
| 041 | 0 | |a eng | |
| 044 | |a gw |c XA-DE-BW | ||
| 049 | |a DE-703 |a DE-83 |a DE-11 | ||
| 050 | 0 | |a QC611.8.W53 | |
| 082 | 0 | |a 621.381522 |2 21 | |
| 082 | 0 | |a 537.6226 |2 22/ger | |
| 084 | |a UH 6710 |0 (DE-625)145771: |2 rvk | ||
| 084 | |a UP 3050 |0 (DE-625)146370: |2 rvk | ||
| 084 | |a 530 |2 sdnb | ||
| 245 | 1 | 0 | |a Wide bandgap light emitting materials and devices |c ed. by Gertrude F. Neumark ... |
| 264 | 1 | |a Weinheim |b Wiley-VCH-Verl. |c 2007 | |
| 300 | |a XI, 214 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Literaturangaben | ||
| 650 | 4 | |a Light emitting diodes | |
| 650 | 4 | |a Wide gap semiconductors | |
| 650 | 0 | 7 | |a Lichtemission |0 (DE-588)4218979-2 |2 gnd |9 rswk-swf |
| 650 | 0 | 7 | |a Wide-bandgap Halbleiter |0 (DE-588)4273153-7 |2 gnd |9 rswk-swf |
| 655 | 7 | |0 (DE-588)4143413-4 |a Aufsatzsammlung |2 gnd-content | |
| 689 | 0 | 0 | |a Wide-bandgap Halbleiter |0 (DE-588)4273153-7 |D s |
| 689 | 0 | 1 | |a Lichtemission |0 (DE-588)4218979-2 |D s |
| 689 | 0 | |5 DE-604 | |
| 700 | 1 | |a Neumark, Gertrude F. |d 1927-2010 |e Sonstige |0 (DE-588)133429520 |4 oth | |
| 856 | 4 | 2 | |q text/html |u http://deposit.dnb.de/cgi-bin/dokserv?id=2909912&prov=M&dok_var=1&dok_ext=htm |3 Inhaltstext |
| 856 | 4 | 2 | |m HBZ Datenaustausch |q application/pdf |u http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=016215980&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |3 Inhaltsverzeichnis |
| 943 | 1 | |a oai:aleph.bib-bvb.de:BVB01-016215980 | |
Datensatz im Suchindex
| _version_ | 1805089654617145345 |
|---|---|
| adam_text |
Contents
Parti
1 Ill-Nitride Light-Emitting Diodes on Novel Substrates 3
Xian-An Cao
1.1 Introduction 3
1.2 LEDs on Sapphire Substrates 4
1.2.1 LED Heteroepitaxy 4
1.2.2 Current Spreading 8
1.2.3 Carrier Transport 10
1.2.4 Carrier Confinement and Localization 12
1.2.5 Radiative and Nonradiative Recombination 18
1.2.6 Light Extraction 20
1.3 LEDs on SiC Substrates 22
1.4 LEDs on Si Substrates 24
1.5 LEDs on Free-Standing GaN Substrates 26
1.5.1 LED Homoepitaxy 26
1.5.2 Electrical Characteristics 29
1.5.3 Optical Characteristics 33
1.5.4 High-Current Operation 37
1.6 LEDs on Other Novel Substrates 41
1.7 Conclusions 43
References 44
2 Ill-Nitride Microcavity Light Emitters 52
Hongx'mg Jiang andjingyu Lin
2.1 Introduction 51
2.2 Ill-Nitride Microstructure Fabrication 52
2.2.1 Microstructure Fabrication by Photolithography Patterning and
Plasma Dry Etching 52
2.2.2 Microscale Pyramids and Prisms Fabricated by Selective Epitaxial
Overgrowth 55
2.2.3 Submicron Waveguides 57
Wide Bandgap Light Emitting Materials and Devices. Edited by G. F. Neumark, I. L. Kuskovsky, and H. Jiang
Copyright © 2007 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim
ISBN: 978-3-527-40331-8
VII Contents
2.3 Optical Studies of Ill-Nitride Microstructures 58
2.3.1 Microdisks 59
2.3.2 Microrings 64
2.3.3 Micropyramids 66
2.3.3.1 Optical Properties 66
2.3.3.2 Pyramidal Microcavities 71
23.4 Submicron Quantum-Well Waveguides 75
2.3.5 Optically Pumped Vertical-Cavity Surface-Emitting Laser
Structures 80
2.4 Current-Injection Microcavity Light-Emitting Diodes 82
2.4.1 Microdisk Cavity LEDs 82
2.4.2 Vertical-Cavity Surface-Emitting LEDs 86
2.5 Ill-Nitride Microscale LED Applications 87
2.5.1 Interconnected Microdisk LEDs for Boosting LED Emission
Efficiencies 88
2.5.2 Nitride Microdisplays 91
2.5.3 Ill-Nitride Photonic Crystals 97
2.6 Concluding Remarks 102
References 205
3 Nitride Emitters - Recent Progress 109
Tao Wang
3.1 Introduction 109
3.2 Ultraviolet Emitters 111
3.2.1 Ultraviolet LEDs Based on GaN Buffer Technology 112
3.2.2 Ultraviolet LEDs Based on GaN-Free Technology 118
3.2.3 Ultraviolet Lasers 125
3.3 InGaN-Based Emitters 130
3.4 Nonpolar and Semipolar Ill-Nitride Emitters 135
3.5 Summary 140
References 140
Part II
4 ZnSeTe Rediscovered: From Isoelectronic Centers to Quantum
Dots 147
Yi Cu, Igor L Kuskovsky, and C. F. Neumark
4.1 Introduction 147
4.2 Sample Growth 149
4.3 Structural Properties 151
4.4 Optical Properties 154
4.4.1 Dilute Bulk ZnSe,_.vTex Alloys 155
4.4.2 8-ZnSe:Te 156
4.4.3 8J-ZnSe:Te 160
4.4.3.1 Type-II Quantum Dots 161
4.4.3.2 Coexistence of Type-II Quantum Dots and Isoelectronic Centers 166
Contents VII
4.4.3.3 Controlling Quantum Dot Size by Varying Growth Conditions 169
4.4.3.4 Magneto-PL of Type-II QDs: Aharonov-Bohm Effect and QD Size 172
4.5 Summary 174
References 176
5 Optical Properties of ZnO Alloys 179
John Muth and Andrei Osinsky
5.1 Introduction 179
5.2 Index of Refraction of ZnO 181
5.3 Excitonic Features of ZnO 185
5.4 Electric Field Effects on Excitons 187
5.5 Photoluminescence 189
5.6 ZnO Alloys 191
References 202
Index 205 |
| adam_txt |
Contents
Parti
1 Ill-Nitride Light-Emitting Diodes on Novel Substrates 3
Xian-An Cao
1.1 Introduction 3
1.2 LEDs on Sapphire Substrates 4
1.2.1 LED Heteroepitaxy 4
1.2.2 Current Spreading 8
1.2.3 Carrier Transport 10
1.2.4 Carrier Confinement and Localization 12
1.2.5 Radiative and Nonradiative Recombination 18
1.2.6 Light Extraction 20
1.3 LEDs on SiC Substrates 22
1.4 LEDs on Si Substrates 24
1.5 LEDs on Free-Standing GaN Substrates 26
1.5.1 LED Homoepitaxy 26
1.5.2 Electrical Characteristics 29
1.5.3 Optical Characteristics 33
1.5.4 High-Current Operation 37
1.6 LEDs on Other Novel Substrates 41
1.7 Conclusions 43
References 44
2 Ill-Nitride Microcavity Light Emitters 52
Hongx'mg Jiang andjingyu Lin
2.1 Introduction 51
2.2 Ill-Nitride Microstructure Fabrication 52
2.2.1 Microstructure Fabrication by Photolithography Patterning and
Plasma Dry Etching 52
2.2.2 Microscale Pyramids and Prisms Fabricated by Selective Epitaxial
Overgrowth 55
2.2.3 Submicron Waveguides 57
Wide Bandgap Light Emitting Materials and Devices. Edited by G. F. Neumark, I. L. Kuskovsky, and H. Jiang
Copyright © 2007 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim
ISBN: 978-3-527-40331-8
VII Contents
2.3 Optical Studies of Ill-Nitride Microstructures 58
2.3.1 Microdisks 59
2.3.2 Microrings 64
2.3.3 Micropyramids 66
2.3.3.1 Optical Properties 66
2.3.3.2 Pyramidal Microcavities 71
23.4 Submicron Quantum-Well Waveguides 75
2.3.5 Optically Pumped Vertical-Cavity Surface-Emitting Laser
Structures 80
2.4 Current-Injection Microcavity Light-Emitting Diodes 82
2.4.1 Microdisk Cavity LEDs 82
2.4.2 Vertical-Cavity Surface-Emitting LEDs 86
2.5 Ill-Nitride Microscale LED Applications 87
2.5.1 Interconnected Microdisk LEDs for Boosting LED Emission
Efficiencies 88
2.5.2 Nitride Microdisplays 91
2.5.3 Ill-Nitride Photonic Crystals 97
2.6 Concluding Remarks 102
References 205
3 Nitride Emitters - Recent Progress 109
Tao Wang
3.1 Introduction 109
3.2 Ultraviolet Emitters 111
3.2.1 Ultraviolet LEDs Based on GaN Buffer Technology 112
3.2.2 Ultraviolet LEDs Based on GaN-Free Technology 118
3.2.3 Ultraviolet Lasers 125
3.3 InGaN-Based Emitters 130
3.4 Nonpolar and Semipolar Ill-Nitride Emitters 135
3.5 Summary 140
References 140
Part II
4 ZnSeTe Rediscovered: From Isoelectronic Centers to Quantum
Dots 147
Yi Cu, Igor L Kuskovsky, and C. F. Neumark
4.1 Introduction 147
4.2 Sample Growth 149
4.3 Structural Properties 151
4.4 Optical Properties 154
4.4.1 Dilute Bulk ZnSe,_.vTex Alloys 155
4.4.2 8-ZnSe:Te 156
4.4.3 8J-ZnSe:Te 160
4.4.3.1 Type-II Quantum Dots 161
4.4.3.2 Coexistence of Type-II Quantum Dots and Isoelectronic Centers 166
Contents VII
4.4.3.3 Controlling Quantum Dot Size by Varying Growth Conditions 169
4.4.3.4 Magneto-PL of Type-II QDs: Aharonov-Bohm Effect and QD Size 172
4.5 Summary 174
References 176
5 Optical Properties of ZnO Alloys 179
John Muth and Andrei Osinsky
5.1 Introduction 179
5.2 Index of Refraction of ZnO 181
5.3 Excitonic Features of ZnO 185
5.4 Electric Field Effects on Excitons 187
5.5 Photoluminescence 189
5.6 ZnO Alloys 191
References 202
Index 205 |
| any_adam_object | 1 |
| any_adam_object_boolean | 1 |
| author_GND | (DE-588)133429520 |
| building | Verbundindex |
| bvnumber | BV023011772 |
| callnumber-first | Q - Science |
| callnumber-label | QC611 |
| callnumber-raw | QC611.8.W53 |
| callnumber-search | QC611.8.W53 |
| callnumber-sort | QC 3611.8 W53 |
| callnumber-subject | QC - Physics |
| classification_rvk | UH 6710 UP 3050 |
| ctrlnum | (OCoLC)170019419 (DE-599)DNB982799489 |
| dewey-full | 621.381522 537.6226 |
| dewey-hundreds | 600 - Technology (Applied sciences) 500 - Natural sciences and mathematics |
| dewey-ones | 621 - Applied physics 537 - Electricity and electronics |
| dewey-raw | 621.381522 537.6226 |
| dewey-search | 621.381522 537.6226 |
| dewey-sort | 3621.381522 |
| dewey-tens | 620 - Engineering and allied operations 530 - Physics |
| discipline | Physik Elektrotechnik / Elektronik / Nachrichtentechnik |
| discipline_str_mv | Physik Elektrotechnik / Elektronik / Nachrichtentechnik |
| format | Book |
| fullrecord | <?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>00000nam a2200000 c 4500</leader><controlfield tag="001">BV023011772</controlfield><controlfield tag="003">DE-604</controlfield><controlfield tag="005">20080205</controlfield><controlfield tag="007">t</controlfield><controlfield tag="008">071120s2007 gw ad|| |||| 00||| eng d</controlfield><datafield tag="015" ind1=" " ind2=" "><subfield code="a">07,N08,1079</subfield><subfield code="2">dnb</subfield></datafield><datafield tag="015" ind1=" " ind2=" "><subfield code="a">07,A43,0678</subfield><subfield code="2">dnb</subfield></datafield><datafield tag="016" ind1="7" ind2=" "><subfield code="a">982799489</subfield><subfield code="2">DE-101</subfield></datafield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">9783527403318</subfield><subfield code="c">Pp. : EUR 119.00 (freier Pr.), sfr 188.00 (freier Pr.)</subfield><subfield code="9">978-3-527-40331-8</subfield></datafield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">3527403310</subfield><subfield code="c">Pp. : EUR 119.00 (freier Pr.), sfr 188.00 (freier Pr.)</subfield><subfield code="9">3-527-40331-0</subfield></datafield><datafield tag="024" ind1="3" ind2=" "><subfield code="a">9783527403318</subfield></datafield><datafield tag="028" ind1="5" ind2="2"><subfield code="a">1140331 000</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)170019419</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)DNB982799489</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-604</subfield><subfield code="b">ger</subfield><subfield code="e">rakddb</subfield></datafield><datafield tag="041" ind1="0" ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="a">gw</subfield><subfield code="c">XA-DE-BW</subfield></datafield><datafield tag="049" ind1=" " ind2=" "><subfield code="a">DE-703</subfield><subfield code="a">DE-83</subfield><subfield code="a">DE-11</subfield></datafield><datafield tag="050" ind1=" " ind2="0"><subfield code="a">QC611.8.W53</subfield></datafield><datafield tag="082" ind1="0" ind2=" "><subfield code="a">621.381522</subfield><subfield code="2">21</subfield></datafield><datafield tag="082" ind1="0" ind2=" "><subfield code="a">537.6226</subfield><subfield code="2">22/ger</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">UH 6710</subfield><subfield code="0">(DE-625)145771:</subfield><subfield code="2">rvk</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">UP 3050</subfield><subfield code="0">(DE-625)146370:</subfield><subfield code="2">rvk</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">530</subfield><subfield code="2">sdnb</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Wide bandgap light emitting materials and devices</subfield><subfield code="c">ed. by Gertrude F. Neumark ...</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Weinheim</subfield><subfield code="b">Wiley-VCH-Verl.</subfield><subfield code="c">2007</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">XI, 214 S.</subfield><subfield code="b">Ill., graph. Darst.</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">Literaturangaben</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Light emitting diodes</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Wide gap semiconductors</subfield></datafield><datafield tag="650" ind1="0" ind2="7"><subfield code="a">Lichtemission</subfield><subfield code="0">(DE-588)4218979-2</subfield><subfield code="2">gnd</subfield><subfield code="9">rswk-swf</subfield></datafield><datafield tag="650" ind1="0" ind2="7"><subfield code="a">Wide-bandgap Halbleiter</subfield><subfield code="0">(DE-588)4273153-7</subfield><subfield code="2">gnd</subfield><subfield code="9">rswk-swf</subfield></datafield><datafield tag="655" ind1=" " ind2="7"><subfield code="0">(DE-588)4143413-4</subfield><subfield code="a">Aufsatzsammlung</subfield><subfield code="2">gnd-content</subfield></datafield><datafield tag="689" ind1="0" ind2="0"><subfield code="a">Wide-bandgap Halbleiter</subfield><subfield code="0">(DE-588)4273153-7</subfield><subfield code="D">s</subfield></datafield><datafield tag="689" ind1="0" ind2="1"><subfield code="a">Lichtemission</subfield><subfield code="0">(DE-588)4218979-2</subfield><subfield code="D">s</subfield></datafield><datafield tag="689" ind1="0" ind2=" "><subfield code="5">DE-604</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Neumark, Gertrude F.</subfield><subfield code="d">1927-2010</subfield><subfield code="e">Sonstige</subfield><subfield code="0">(DE-588)133429520</subfield><subfield code="4">oth</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="q">text/html</subfield><subfield code="u">http://deposit.dnb.de/cgi-bin/dokserv?id=2909912&prov=M&dok_var=1&dok_ext=htm</subfield><subfield code="3">Inhaltstext</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="m">HBZ Datenaustausch</subfield><subfield code="q">application/pdf</subfield><subfield code="u">http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=016215980&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA</subfield><subfield code="3">Inhaltsverzeichnis</subfield></datafield><datafield tag="943" ind1="1" ind2=" "><subfield code="a">oai:aleph.bib-bvb.de:BVB01-016215980</subfield></datafield></record></collection> |
| genre | (DE-588)4143413-4 Aufsatzsammlung gnd-content |
| genre_facet | Aufsatzsammlung |
| id | DE-604.BV023011772 |
| illustrated | Illustrated |
| index_date | 2024-07-02T19:09:43Z |
| indexdate | 2024-07-20T09:27:22Z |
| institution | BVB |
| isbn | 9783527403318 3527403310 |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-016215980 |
| oclc_num | 170019419 |
| open_access_boolean | |
| owner | DE-703 DE-83 DE-11 |
| owner_facet | DE-703 DE-83 DE-11 |
| physical | XI, 214 S. Ill., graph. Darst. |
| publishDate | 2007 |
| publishDateSearch | 2007 |
| publishDateSort | 2007 |
| publisher | Wiley-VCH-Verl. |
| record_format | marc |
| spelling | Wide bandgap light emitting materials and devices ed. by Gertrude F. Neumark ... Weinheim Wiley-VCH-Verl. 2007 XI, 214 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Literaturangaben Light emitting diodes Wide gap semiconductors Lichtemission (DE-588)4218979-2 gnd rswk-swf Wide-bandgap Halbleiter (DE-588)4273153-7 gnd rswk-swf (DE-588)4143413-4 Aufsatzsammlung gnd-content Wide-bandgap Halbleiter (DE-588)4273153-7 s Lichtemission (DE-588)4218979-2 s DE-604 Neumark, Gertrude F. 1927-2010 Sonstige (DE-588)133429520 oth text/html http://deposit.dnb.de/cgi-bin/dokserv?id=2909912&prov=M&dok_var=1&dok_ext=htm Inhaltstext HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=016215980&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Wide bandgap light emitting materials and devices Light emitting diodes Wide gap semiconductors Lichtemission (DE-588)4218979-2 gnd Wide-bandgap Halbleiter (DE-588)4273153-7 gnd |
| subject_GND | (DE-588)4218979-2 (DE-588)4273153-7 (DE-588)4143413-4 |
| title | Wide bandgap light emitting materials and devices |
| title_auth | Wide bandgap light emitting materials and devices |
| title_exact_search | Wide bandgap light emitting materials and devices |
| title_exact_search_txtP | Wide bandgap light emitting materials and devices |
| title_full | Wide bandgap light emitting materials and devices ed. by Gertrude F. Neumark ... |
| title_fullStr | Wide bandgap light emitting materials and devices ed. by Gertrude F. Neumark ... |
| title_full_unstemmed | Wide bandgap light emitting materials and devices ed. by Gertrude F. Neumark ... |
| title_short | Wide bandgap light emitting materials and devices |
| title_sort | wide bandgap light emitting materials and devices |
| topic | Light emitting diodes Wide gap semiconductors Lichtemission (DE-588)4218979-2 gnd Wide-bandgap Halbleiter (DE-588)4273153-7 gnd |
| topic_facet | Light emitting diodes Wide gap semiconductors Lichtemission Wide-bandgap Halbleiter Aufsatzsammlung |
| url | http://deposit.dnb.de/cgi-bin/dokserv?id=2909912&prov=M&dok_var=1&dok_ext=htm http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=016215980&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT neumarkgertrudef widebandgaplightemittingmaterialsanddevices |